{"id":58303,"date":"2026-02-11T12:09:50","date_gmt":"2026-02-11T17:09:50","guid":{"rendered":"https:\/\/toncamion.com\/?p=58303"},"modified":"2026-04-06T22:38:20","modified_gmt":"2026-04-07T02:38:20","slug":"2026-gmc-sierra-2500hd-at4-diesel-review","status":"publish","type":"post","link":"https:\/\/yourpickup.ca\/?p=58303&lang=en","title":{"rendered":"2026 GMC Sierra 2500HD AT4 Diesel Review: Towing, Torque &#038; Real-World Test"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_80 ez-toc-wrap-center counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table des mati\u00e8res<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #000000;color:#000000\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #000000;color:#000000\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/yourpickup.ca\/?p=58303&#038;lang=en\/#The_ultimate_guide_to_a_truck_built_for_real_heavy-duty_work\" >The ultimate guide to a truck built for real heavy-duty work<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/yourpickup.ca\/?p=58303&#038;lang=en\/#First_a_well-deserved_thank_you\" >First, a well-deserved thank you!<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/yourpickup.ca\/?p=58303&#038;lang=en\/#An_imposing_stance_designed_for_serious_work\" >An imposing stance, designed for serious work<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/yourpickup.ca\/?p=58303&#038;lang=en\/#Prefer_video_Heres_the_full_test_drive\" >Prefer video? Here\u2019s the full test drive<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/yourpickup.ca\/?p=58303&#038;lang=en\/#Diesel_power_colossal_torque_and_exceptional_towing_capability\" >Diesel power: colossal torque and exceptional towing capability<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/yourpickup.ca\/?p=58303&#038;lang=en\/#A_cabin_built_to_work_%E2%80%94_and_surprisingly_luxurious\" >A cabin built to work \u2014 and surprisingly luxurious<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/yourpickup.ca\/?p=58303&#038;lang=en\/#The_MultiPro_Tailgate_is_a_must-have\" >The MultiPro Tailgate is a must-have<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/yourpickup.ca\/?p=58303&#038;lang=en\/#Onboard_tech_safety_and_towing_assistance_done_right\" >Onboard tech: safety and towing assistance done right<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/yourpickup.ca\/?p=58303&#038;lang=en\/#Towing_capability_%E2%80%94_promise_vs_reality\" >Towing capability \u2014 promise vs. reality<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/yourpickup.ca\/?p=58303&#038;lang=en\/#_Highlights_that_genuinely_impress\" >+ Highlights that genuinely impress<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/yourpickup.ca\/?p=58303&#038;lang=en\/#1_Diesel_torque_and_next-level_capability\" >1. Diesel torque and next-level capability<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/yourpickup.ca\/?p=58303&#038;lang=en\/#2_Driver-assist_tech_and_advanced_cameras\" >2. Driver-assist tech and advanced cameras<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/yourpickup.ca\/?p=58303&#038;lang=en\/#3_Comfort_and_modern_features\" >3. Comfort and modern features<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/yourpickup.ca\/?p=58303&#038;lang=en\/#4_Toughness_and_versatility\" >4. Toughness and versatility<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/yourpickup.ca\/?p=58303&#038;lang=en\/#%E2%80%93_The_limits_because_nothing_is_perfect\" >&#8211; The limits, because nothing is perfect<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/yourpickup.ca\/?p=58303&#038;lang=en\/#1_Size_and_massive_dimensions\" >1. Size and massive dimensions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/yourpickup.ca\/?p=58303&#038;lang=en\/#2_Price_and_operating_costs\" >2. Price and operating costs<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/yourpickup.ca\/?p=58303&#038;lang=en\/#3_Less_agility_at_low_speeds\" >3. Less agility at low speeds<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/yourpickup.ca\/?p=58303&#038;lang=en\/#4_Inconsistent_cabin_temperature\" >4. Inconsistent cabin temperature<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/yourpickup.ca\/?p=58303&#038;lang=en\/#Verdict_a_truck_that_meets_expectations_%E2%80%94_and_then_some\" >Verdict: a truck that meets expectations \u2014 and then some<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/yourpickup.ca\/?p=58303&#038;lang=en\/#%F0%9F%93%8A_2026_GMC_Sierra_2500_AT4_Diesel_%E2%80%94_Rating\" >\ud83d\udcca 2026 GMC Sierra 2500 AT4 Diesel \u2014 Rating<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/yourpickup.ca\/?p=58303&#038;lang=en\/#Useful_Links\" >Useful Links<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/yourpickup.ca\/?p=58303&#038;lang=en\/#Foire_aux_questions_FAQ\" >Foire aux questions (FAQ)<\/a><\/li><\/ul><\/nav><\/div>\n<style><span data-mce-type=\"bookmark\" style=\"display: inline-block; width: 0px; overflow: hidden; line-height: 0;\" class=\"mce_SELRES_start\">\ufeff<\/span><br \/>\/* =====================================<br \/>FULL WIDTH MEDIA \u2013 TONCAMION \/ YOURPICKUP<br \/>===================================== *\/<\/p>\r\n<p>\/* Conteneur principal *\/<br \/>.tc-fullwidth-media{<br \/>display:block;<br \/>width:100%;<br \/>max-width:1600px;<br \/>margin:48px auto; \/* espace vertical style magazine *\/<br \/>padding:0;<br \/>}<\/p>\r\n<p>\/* Images *\/<br \/>.tc-fullwidth-media img{<br \/>display:block;<br \/>width:100%;<br \/>max-width:1600px;<br \/>height:auto;<\/p>\r\n<p>margin-left:auto;<br \/>margin-right:auto;<\/p>\r\n<p>float:none !important; \/* casse les alignleft\/right *\/<br \/>clear:both;<\/p>\r\n<p>border-radius:6px; \/* look premium *\/<br \/>}<\/p>\r\n<p>\/* Vid\u00e9os *\/<br \/>.tc-fullwidth-media iframe{<br \/>display:block;<br \/>width:100%;<br \/>max-width:1600px;<br \/>aspect-ratio:16\/9;<br \/>height:auto;<\/p>\r\n<p>margin-left:auto;<br \/>margin-right:auto;<\/p>\r\n<p>border:0;<br \/>border-radius:6px;<br \/>}<\/p>\r\n<p>\/* Emp\u00eache WP d\u2019imposer ses alignements *\/<br \/>.tc-fullwidth-media .alignleft,<br \/>.tc-fullwidth-media .alignright,<br \/>.tc-fullwidth-media .aligncenter{<br \/>float:none !important;<br \/>margin-left:auto !important;<br \/>margin-right:auto !important;<br \/>}<\/p>\r\n<p>\/* Supprime les marges parasites de certains th\u00e8mes *\/<br \/>.tc-fullwidth-media figure{<br \/>margin:0;<br \/>}<\/p>\r\n<p>\/* =====================================<br \/>MOBILE OPTIMIZATION<br \/>===================================== *\/<\/p>\r\n<p>@media (max-width:1024px){<\/p>\r\n<p><span data-mce-type=\"bookmark\" style=\"display: inline-block; width: 0px; overflow: hidden; line-height: 0;\" class=\"mce_SELRES_start\">\ufeff<\/span><\/p>\r\n<p>.tc-fullwidth-media{<br \/>margin:36px auto;<br \/>}<\/p>\r\n<p>}<\/p>\r\n<p>@media (max-width:768px){<\/p>\r\n<p>.tc-fullwidth-media{<br \/>margin:28px auto;<br \/>}<\/p>\r\n<p>.tc-fullwidth-media img{<br \/>border-radius:4px;<br \/>}<\/p>\r\n<p>}<br \/>\/* Wrapper 16:9 ultra fiable *\/<br \/>.tc-video-wrapper{<br \/>  position:relative;<br \/>  width:100%;<br \/>  max-width:1600px;<br \/>  margin:0 auto;<br \/>  padding-top:56.25%; \/* 16:9 = 9 \/ 16 = 56.25% *\/<br \/>}<\/p>\r\n<p>\/* Vid\u00e9o *\/<br \/>.tc-video-wrapper iframe{<br \/>  position:absolute;<br \/>  top:0;<br \/>  left:0;<br \/>  width:100%;<br \/>  height:100%;<br \/>  border:0;<br \/>}<br \/><span data-mce-type=\"bookmark\" style=\"display: inline-block; width: 0px; overflow: hidden; line-height: 0;\" class=\"mce_SELRES_start\">\ufeff<\/span><\/p>\r\n<\/style>\r\n<h2><span class=\"ez-toc-section\" id=\"The_ultimate_guide_to_a_truck_built_for_real_heavy-duty_work\"><\/span>The ultimate guide to a truck built for real heavy-duty work<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<strong>The 2026 GMC Sierra 2500 AT4 Diesel<\/strong> isn\u2019t just a truck: it\u2019s a modern work beast, capable of hauling and towing massive loads while delivering premium-grade technology and safety. On paper, this HD truck is impressive. On the road and on the jobsite, it delivers on its promises \u2014 and sometimes even exceeds them.\r\n\r\nIn this article, we take a deep dive into every facet of this heavy hitter, from key technical highlights to real strengths, limitations, and what you <strong>absolutely need to know before buying<\/strong>.\r\n<h2><span class=\"ez-toc-section\" id=\"First_a_well-deserved_thank_you\"><\/span>First, a well-deserved thank you!<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\nI want to thank <a href=\"https:\/\/www.racineauto.ca\/\" target=\"_blank\" rel=\"noopener\">Racine Chevrolet<\/a> in Saint-Jean-sur-Richelieu. Thanks to them, I had the chance to test this great truck. And if it interests you, don\u2019t hesitate to reach out \u2014 their team is top-notch.\r\n<div class=\"tc-fullwidth-media\"><a href=\"https:\/\/www.racineauto.ca\/\" target=\"_blank\" rel=\"noopener\">\r\n<img decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/yourpickup.ca\/wp-content\/uploads\/2026\/02\/image016_orig.jpg\" alt=\"\" \/>\r\n<\/a><\/div>\r\n<h2><span class=\"ez-toc-section\" id=\"An_imposing_stance_designed_for_serious_work\"><\/span><strong>An imposing stance, designed for serious work<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\r\nVisually, the <a href=\"https:\/\/www.gmccanada.ca\/fr\/trucks\/sierra-hd\" target=\"_blank\" rel=\"noopener\">2026 Sierra 2500 AT4<\/a> commands respect. It wears a massive grille, chunky bumpers, and a tall ride height that immediately signals its \u201c<strong>work and off-road<\/strong>\u201d mission. The intent is crystal clear: tackle rough ground, carry heavy payloads, tow without compromise, and provide a reliable platform for demanding jobs.\r\n\r\nWith its generous dimensions, it stands apart from more \u201ccivilized\u201d lifestyle-focused pickups. The <strong>ground clearance, available big tires, and suspension tuned for light-to-medium off-road use<\/strong> give the Sierra a posture that looks ready to absorb real-world punishment.\r\n<div class=\"tc-fullwidth-media\"><img decoding=\"async\" src=\"https:\/\/yourpickup.ca\/wp-content\/uploads\/2026\/02\/IMG_1620-1566x1600.jpg\" alt=\"\" \/><\/div>\r\n<h2><span class=\"ez-toc-section\" id=\"Prefer_video_Heres_the_full_test_drive\"><\/span>Prefer video? Here\u2019s the full test drive<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<div class=\"tc-fullwidth-media\">\r\n<div class=\"tc-video-wrapper\"><iframe title=\"I tested the 2026 GMC Sierra AT4 2500\" src=\"https:\/\/www.youtube.com\/embed\/FxrtWfwoa3c?controls=1&amp;rel=0&amp;playsinline=0&amp;cc_load_policy=0&amp;autoplay=0\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\">\r\n<\/iframe><\/div>\r\n<\/div>\r\n<h2><span class=\"ez-toc-section\" id=\"Diesel_power_colossal_torque_and_exceptional_towing_capability\"><\/span>Diesel power: colossal torque and exceptional towing capability<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\nUnder the hood of the 2026 Sierra 2500 AT4, the powertrain choice is a deciding factor: the <strong>6.6L Duramax turbo-diesel<\/strong>. This turbocharged V8 delivers roughly <strong>470 hp and a jaw-dropping 975 lb-ft of torque<\/strong>, making it especially well-suited for serious towing.\r\n\r\nThat torque translates into <strong>smooth, effortless pull up to impressive levels<\/strong> \u2014 ideal for heavy trailers, big fifth-wheels, or equipment hauled long distances. With this engine, the Sierra 2500 AT4 can reach towing figures of <strong>up to around 20,000 lb conventional<\/strong>, and <strong>over 21,000 lb in gooseneck\/fifth-wheel configuration<\/strong> depending on options \u2014 putting it firmly in the heavy hitters of its segment.\r\n\r\nThe robust <strong>Allison 10-speed automatic<\/strong> pairs perfectly with the diesel, delivering smooth shifts and strong efficiency on the highway and under heavy load.\r\n\r\n<section class=\"elementor-section elementor-top-section elementor-element elementor-element-4bd9d37 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"4bd9d37\" data-element_type=\"section\">\r\n<div class=\"elementor-container elementor-column-gap-default\">\r\n<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-e43dae7\" data-id=\"e43dae7\" data-element_type=\"column\">\r\n<div class=\"elementor-widget-wrap elementor-element-populated e-swiper-container\">\r\n<div class=\"elementor-element elementor-element-2828f98 elementor-arrows-position-inside elementor-pagination-position-outside elementor-widget elementor-widget-image-carousel e-widget-swiper\" data-id=\"2828f98\" data-element_type=\"widget\" data-settings=\"{&quot;navigation&quot;:&quot;both&quot;,&quot;autoplay&quot;:&quot;yes&quot;,&quot;pause_on_hover&quot;:&quot;yes&quot;,&quot;pause_on_interaction&quot;:&quot;yes&quot;,&quot;autoplay_speed&quot;:5000,&quot;infinite&quot;:&quot;yes&quot;,&quot;speed&quot;:500}\" data-widget_type=\"image-carousel.default\">\r\n<div class=\"elementor-widget-container\">\r\n<div class=\"elementor-image-carousel-wrapper swiper swiper-initialized swiper-horizontal swiper-pointer-events\" dir=\"ltr\" role=\"region\" aria-roledescription=\"carousel\" aria-label=\"Carrousel d\u2019images\">\r\n<div id=\"swiper-wrapper-42547c379a6b6a9c\" class=\"elementor-image-carousel swiper-wrapper\" style=\"transform: translate3d(-1680px, 0px, 0px); transition-duration: 0ms;\" aria-live=\"off\">\r\n<div class=\"swiper-slide swiper-slide-duplicate swiper-slide-duplicate-active\" style=\"width: 240px;\" role=\"group\" aria-roledescription=\"slide\" aria-label=\"5 \/ 7\" data-swiper-slide-index=\"4\" aria-hidden=\"true\">\r\n<figure class=\"swiper-slide-inner\"><img decoding=\"async\" class=\"swiper-slide-image\" src=\"https:\/\/toncamion.com\/wp-content\/uploads\/2026\/02\/IMG_1519-480x480.jpeg\" alt=\"GMC SIERRA 2500 AT4 2026\" \/><\/figure>\r\n<\/div>\r\n<div class=\"swiper-slide swiper-slide-duplicate swiper-slide-duplicate-next\" style=\"width: 240px;\" role=\"group\" aria-roledescription=\"slide\" aria-label=\"6 \/ 7\" data-swiper-slide-index=\"5\" aria-hidden=\"true\">\r\n<figure class=\"swiper-slide-inner\"><img decoding=\"async\" class=\"swiper-slide-image\" src=\"https:\/\/toncamion.com\/wp-content\/uploads\/2026\/02\/IMG_1528-480x480.jpeg\" alt=\"GMC SIERRA 2500 AT4 2026\" \/><\/figure>\r\n<\/div>\r\n<div class=\"swiper-slide swiper-slide-duplicate\" style=\"width: 240px;\" role=\"group\" aria-roledescription=\"slide\" aria-label=\"7 \/ 7\" data-swiper-slide-index=\"6\" aria-hidden=\"true\">\r\n<figure class=\"swiper-slide-inner\"><img decoding=\"async\" class=\"swiper-slide-image\" src=\"https:\/\/toncamion.com\/wp-content\/uploads\/2026\/02\/IMG_1530-480x480.jpeg\" alt=\"GMC SIERRA 2500 AT4 2026\" \/><\/figure>\r\n<\/div>\r\n<div class=\"swiper-slide\" style=\"width: 240px;\" role=\"group\" aria-roledescription=\"slide\" aria-label=\"1 \/ 7\" data-swiper-slide-index=\"0\" aria-hidden=\"true\">\r\n<figure class=\"swiper-slide-inner\"><img decoding=\"async\" class=\"swiper-slide-image\" src=\"https:\/\/toncamion.com\/wp-content\/uploads\/2026\/02\/IMG_1639-480x480.jpeg\" alt=\"GMC SIERRA 2500 AT4 2026\" \/><\/figure>\r\n<\/div>\r\n<div class=\"swiper-slide\" style=\"width: 240px;\" role=\"group\" aria-roledescription=\"slide\" aria-label=\"2 \/ 7\" data-swiper-slide-index=\"1\" aria-hidden=\"true\">\r\n<figure class=\"swiper-slide-inner\"><img decoding=\"async\" class=\"swiper-slide-image\" src=\"https:\/\/toncamion.com\/wp-content\/uploads\/2026\/02\/IMG_1538-480x480.jpeg\" alt=\"GMC SIERRA 2500 AT4 2026\" \/><\/figure>\r\n<\/div>\r\n<div class=\"swiper-slide\" style=\"width: 240px;\" role=\"group\" aria-roledescription=\"slide\" aria-label=\"3 \/ 7\" data-swiper-slide-index=\"2\" aria-hidden=\"true\">\r\n<figure class=\"swiper-slide-inner\"><img decoding=\"async\" class=\"swiper-slide-image\" src=\"https:\/\/toncamion.com\/wp-content\/uploads\/2026\/02\/IMG_1535-480x480.jpeg\" alt=\"GMC SIERRA 2500 AT4 2026\" \/><\/figure>\r\n<\/div>\r\n<div class=\"swiper-slide swiper-slide-prev\" style=\"width: 240px;\" role=\"group\" aria-roledescription=\"slide\" aria-label=\"4 \/ 7\" data-swiper-slide-index=\"3\" aria-hidden=\"true\">\r\n<figure class=\"swiper-slide-inner\"><img decoding=\"async\" class=\"swiper-slide-image\" src=\"https:\/\/toncamion.com\/wp-content\/uploads\/2026\/02\/IMG_1534-480x480.jpeg\" alt=\"GMC SIERRA 2500 AT4 2026\" \/><\/figure>\r\n<\/div>\r\n<div class=\"swiper-slide swiper-slide-active\" style=\"width: 240px;\" role=\"group\" aria-roledescription=\"slide\" aria-label=\"5 \/ 7\" data-swiper-slide-index=\"4\">\r\n<figure class=\"swiper-slide-inner\"><img decoding=\"async\" class=\"swiper-slide-image\" src=\"https:\/\/toncamion.com\/wp-content\/uploads\/2026\/02\/IMG_1519-480x480.jpeg\" alt=\"GMC SIERRA 2500 AT4 2026\" \/><\/figure>\r\n<\/div>\r\n<div class=\"swiper-slide swiper-slide-next\" style=\"width: 240px;\" role=\"group\" aria-roledescription=\"slide\" aria-label=\"6 \/ 7\" data-swiper-slide-index=\"5\">\r\n<figure class=\"swiper-slide-inner\"><img decoding=\"async\" class=\"swiper-slide-image\" src=\"https:\/\/toncamion.com\/wp-content\/uploads\/2026\/02\/IMG_1528-480x480.jpeg\" alt=\"GMC SIERRA 2500 AT4 2026\" \/><\/figure>\r\n<\/div>\r\n<div class=\"swiper-slide\" style=\"width: 240px;\" role=\"group\" aria-roledescription=\"slide\" aria-label=\"7 \/ 7\" data-swiper-slide-index=\"6\">\r\n<figure class=\"swiper-slide-inner\"><img decoding=\"async\" class=\"swiper-slide-image\" src=\"https:\/\/toncamion.com\/wp-content\/uploads\/2026\/02\/IMG_1530-480x480.jpeg\" alt=\"GMC SIERRA 2500 AT4 2026\" \/><\/figure>\r\n<\/div>\r\n<div class=\"swiper-slide swiper-slide-duplicate\" style=\"width: 240px;\" role=\"group\" aria-roledescription=\"slide\" aria-label=\"1 \/ 7\" data-swiper-slide-index=\"0\" aria-hidden=\"true\">\r\n<figure class=\"swiper-slide-inner\"><img decoding=\"async\" class=\"swiper-slide-image\" src=\"https:\/\/toncamion.com\/wp-content\/uploads\/2026\/02\/IMG_1639-480x480.jpeg\" alt=\"GMC SIERRA 2500 AT4 2026\" \/><\/figure>\r\n<\/div>\r\n<div class=\"swiper-slide swiper-slide-duplicate\" style=\"width: 240px;\" role=\"group\" aria-roledescription=\"slide\" aria-label=\"2 \/ 7\" data-swiper-slide-index=\"1\" aria-hidden=\"true\">\r\n<figure class=\"swiper-slide-inner\"><img decoding=\"async\" class=\"swiper-slide-image\" src=\"https:\/\/toncamion.com\/wp-content\/uploads\/2026\/02\/IMG_1538-480x480.jpeg\" alt=\"GMC SIERRA 2500 AT4 2026\" \/><\/figure>\r\n<\/div>\r\n<div class=\"swiper-slide swiper-slide-duplicate\" style=\"width: 240px;\" role=\"group\" aria-roledescription=\"slide\" aria-label=\"3 \/ 7\" data-swiper-slide-index=\"2\" aria-hidden=\"true\">\r\n<figure class=\"swiper-slide-inner\"><img decoding=\"async\" class=\"swiper-slide-image\" src=\"https:\/\/toncamion.com\/wp-content\/uploads\/2026\/02\/IMG_1535-480x480.jpeg\" alt=\"GMC SIERRA 2500 AT4 2026\" \/><\/figure>\r\n<\/div>\r\n<\/div>\r\n<div class=\"elementor-swiper-button elementor-swiper-button-prev\" tabindex=\"0\" role=\"button\" aria-label=\"Previous slide\" aria-controls=\"swiper-wrapper-42547c379a6b6a9c\"><\/div>\r\n<div class=\"elementor-swiper-button elementor-swiper-button-next\" tabindex=\"0\" role=\"button\" aria-label=\"Next slide\" aria-controls=\"swiper-wrapper-42547c379a6b6a9c\"><\/div>\r\n<div class=\"swiper-pagination swiper-pagination-clickable swiper-pagination-bullets swiper-pagination-horizontal\"><\/div>\r\n&nbsp;\r\n\r\n<\/div>\r\n<\/div>\r\n<\/div>\r\n<\/div>\r\n<\/div>\r\n<\/div>\r\n<\/section>\r\n<h2><span class=\"ez-toc-section\" id=\"A_cabin_built_to_work_%E2%80%94_and_surprisingly_luxurious\"><\/span>A cabin built to work \u2014 and surprisingly luxurious<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\nWhat\u2019s pleasantly surprising when you climb into the Sierra 2500 AT4 is that, despite its work-first mission, the interior doesn\u2019t sacrifice comfort or tech.\r\n\r\nOn well-equipped trims, you get a <strong>13.4-inch touchscreen<\/strong>, a <strong>customizable digital driver display<\/strong>, and <strong>wireless Apple CarPlay and Android Auto<\/strong> via Google Built-in.\r\n\r\nHeated and ventilated seats, strong cabin ergonomics, and overall material quality create a serious, versatile vibe. It\u2019s a space that can handle a long day on the jobsite just as well as a comfortable highway run.\r\n<h2><span class=\"ez-toc-section\" id=\"The_MultiPro_Tailgate_is_a_must-have\"><\/span>The MultiPro Tailgate is a must-have<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<div class=\"tc-fullwidth-media\"><img decoding=\"async\" src=\"https:\/\/yourpickup.ca\/wp-content\/uploads\/2026\/02\/Hayon-Multiusage.png\" alt=\"GMC MultiPro Tailgate\" \/><\/div>\r\nThe <strong>GMC MultiPro Tailgate<\/strong> is, without exaggeration, one of the smartest and most useful features on the 2026 Sierra 2500 AT4. It\u2019s far more than a simple tailgate \u2014 it transforms everyday loading and work routines.\r\n\r\nWith its <strong>six different configurations<\/strong>, it can act as a wide, stable step into the box, an extension to support longer materials, a mobile work surface, or even a load stop for securing partial cargo.\r\n\r\nOn a tall, imposing HD truck, this quickly becomes indispensable \u2014 especially when moving heavy tools, gear bins, or bulky equipment. In real use, you end up using it constantly because it improves ergonomics and reduces the physical effort of loading and unloading.\r\n\r\nThis is exactly the kind of detail that separates a truck that\u2019s merely powerful from one that\u2019s <strong>truly designed for people who work with it<\/strong>. On the Sierra AT4, the MultiPro Tailgate isn\u2019t a gimmick \u2014 it\u2019s a practical, clever, highly functional advantage.\r\n<h2><span class=\"ez-toc-section\" id=\"Onboard_tech_safety_and_towing_assistance_done_right\"><\/span>Onboard tech: safety and towing assistance done right<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<div class=\"tc-fullwidth-media\"><img decoding=\"async\" src=\"https:\/\/yourpickup.ca\/wp-content\/uploads\/2026\/02\/Lecran-13.4-pouces-interactive-du-GMC-Sierra-2500-AT4-2026-1600x797.png\" alt=\"\" \/><\/div>\r\nOne of this Sierra\u2019s undeniable strengths is its <strong>onboard technology<\/strong>, especially for safety and towing.\r\n\r\nThe truck can be equipped with <strong>up to 14 different cameras<\/strong>, including panoramic views and towing-specific functions like \u201cTransparent Trailer View,\u201d which helps you \u201csee through\u201d the trailer for precision manoeuvres in tight spaces.\r\n\r\nIt also adds advanced driver-assist features such as:\r\n<ul>\r\n \t<li>adaptive cruise control,<\/li>\r\n \t<li>forward collision alert,<\/li>\r\n \t<li>automatic emergency braking,<\/li>\r\n \t<li>lane-keeping assist,<\/li>\r\n \t<li>and a following-distance monitoring system.<\/li>\r\n<\/ul>\r\nThese technologies make perfect sense in a truck this size: they reduce driver fatigue, make delicate manoeuvres safer, and build confidence \u2014 especially when you\u2019re pulling heavy trailers.\r\n<div class=\"tc-fullwidth-media\"><img decoding=\"async\" src=\"https:\/\/yourpickup.ca\/wp-content\/uploads\/2026\/02\/Linterieur-luxueux-du-GMC-Sierra-2500-AT4-2026-1600x795.png\" alt=\"\" \/><\/div>\r\n<h2><span class=\"ez-toc-section\" id=\"Towing_capability_%E2%80%94_promise_vs_reality\"><\/span>Towing capability \u2014 promise vs. reality<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\nOn paper, the promise is clear: a truck built to <strong>move massive loads<\/strong> with ease. In the real world, the road experience backs up the numbers.\r\n\r\nWith the diesel and the right options, the Sierra 2500 AT4 behaves like a <strong>light road-going tractor<\/strong>: it accelerates with no drama even when loaded or towing heavy, holds steady highway cruising speeds, and handles steep grades without losing its edge.\r\n\r\nThe towing-assist technology and the diesel\u2019s stability deliver a towing experience that many competitors in this category simply don\u2019t match as completely.\r\n<div class=\"tc-fullwidth-media\"><img decoding=\"async\" src=\"https:\/\/yourpickup.ca\/wp-content\/uploads\/2026\/02\/20-000lbs-de-capacite-de-remorquage-sur-le-GMC-Sierra-2500-AT4-2026.png\" alt=\"\" \/><\/div>\r\n<h2><span class=\"ez-toc-section\" id=\"_Highlights_that_genuinely_impress\"><\/span><span style=\"color: #008000;\">+ Highlights that genuinely impress<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<h3><span class=\"ez-toc-section\" id=\"1_Diesel_torque_and_next-level_capability\"><\/span><span style=\"color: #008000;\"><strong>1. Diesel torque and next-level capability<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\r\nThe turbo-diesel engine truly makes the difference when towing heavy or climbing steep grades with a serious load.\r\n<h3><span class=\"ez-toc-section\" id=\"2_Driver-assist_tech_and_advanced_cameras\"><\/span><span style=\"color: #008000;\"><strong>2. Driver-assist tech and advanced cameras<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\r\nBeing able to monitor every zone around the truck \u2014 especially with a trailer \u2014 is a major safety advantage.\r\n<h3><span class=\"ez-toc-section\" id=\"3_Comfort_and_modern_features\"><\/span><span style=\"color: #008000;\"><strong>3. Comfort and modern features<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\r\nFor a work-focused truck, the interior feels closer to a premium SUV than a basic utility tool.\r\n<h3><span class=\"ez-toc-section\" id=\"4_Toughness_and_versatility\"><\/span><span style=\"color: #008000;\"><strong>4. Toughness and versatility<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\r\nThe Sierra isn\u2019t just built for the jobsite: it can also serve as a second family or highway vehicle without major comfort compromises.\r\n<h2><span class=\"ez-toc-section\" id=\"%E2%80%93_The_limits_because_nothing_is_perfect\"><\/span><span style=\"color: #ff6600;\">&#8211; The limits, because nothing is perfect<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<h3><span class=\"ez-toc-section\" id=\"1_Size_and_massive_dimensions\"><\/span><span style=\"color: #ff6600;\"><strong>1. Size and massive dimensions<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\r\nThis isn\u2019t an easy truck to manoeuvre in urban settings or on narrow roads \u2014 especially with a trailer. It takes some getting used to.\r\n<h3><span class=\"ez-toc-section\" id=\"2_Price_and_operating_costs\"><\/span><span style=\"color: #ff6600;\"><strong>2. Price and operating costs<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\r\nA well-equipped Sierra 2500 AT4 can get expensive quickly, particularly with comfort and tech options. Maintenance and quality diesel also come with real costs.\r\n<h3><span class=\"ez-toc-section\" id=\"3_Less_agility_at_low_speeds\"><\/span><span style=\"color: #ff6600;\"><strong>3. Less agility at low speeds<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\r\nCompared to lighter pickups or less premium HD trucks, it can feel heavy in tight corners and slow-speed manoeuvres.\r\n<h3><span class=\"ez-toc-section\" id=\"4_Inconsistent_cabin_temperature\"><\/span><span style=\"color: #ff6600;\"><strong>4. Inconsistent cabin temperature<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\r\nIt always feels either a bit too hot or a bit too cold inside. That missing half-degree sounds minor, but it gets annoying over time.\r\n<h2><span class=\"ez-toc-section\" id=\"Verdict_a_truck_that_meets_expectations_%E2%80%94_and_then_some\"><\/span><strong>Verdict: a truck that meets expectations \u2014 and then some<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\r\nIf this test drive got me genuinely excited, it\u2019s for a reason. The <strong>2026 GMC Sierra 2500 AT4 Diesel<\/strong> is <strong>functional, strong, technologically advanced, and sculpted for real demanding work<\/strong>. It offers major towing confidence, strong mechanical credibility, and surprisingly high comfort for a truck in this class.\r\n\r\nFor anyone who needs a truck that can handle tough work conditions while still being enjoyable on the road, <strong>this Sierra is a choice that goes well beyond basic utility<\/strong>. It can easily serve as a primary work truck, a regular tow rig, or a capable all-around truck for ambitious personal projects.\r\n<div class=\"tc-fullwidth-media\"><img decoding=\"async\" src=\"https:\/\/yourpickup.ca\/wp-content\/uploads\/2026\/02\/GMC-Sierra-2500-AT4-2026-En-action.png\" alt=\"\" \/><\/div>\r\n<h2><span class=\"ez-toc-section\" id=\"%F0%9F%93%8A_2026_GMC_Sierra_2500_AT4_Diesel_%E2%80%94_Rating\"><\/span>\ud83d\udcca 2026 GMC Sierra 2500 AT4 Diesel \u2014 Rating<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\nHere is our detailed rating of the 2026 GMC Sierra 2500 AT4 Diesel based on real-world driving, towing performance, comfort, technology, and overall capability.\r\n<table>\r\n<thead>\r\n<tr>\r\n<th>Category<\/th>\r\n<th>Score \/10<\/th>\r\n<th>Explanation<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td><strong>Engine Power<\/strong><\/td>\r\n<td><strong>9\/10<\/strong><\/td>\r\n<td>The 6.6L Duramax diesel delivers monumental torque that makes heavy towing feel nearly effortless, even on rolling terrain or at full load.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>Towing Capacity<\/strong><\/td>\r\n<td><strong>9\/10<\/strong><\/td>\r\n<td>With over 20,000 lb available depending on configuration, it\u2019s a true towing machine for fifth-wheels, enclosed trailers, and industrial equipment.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>Ride Comfort<\/strong><\/td>\r\n<td><strong>8\/10<\/strong><\/td>\r\n<td>Despite its massive size, the suspension absorbs road imperfections extremely well, while the seats provide impressive long-distance comfort for an HD truck.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>Onboard Technology<\/strong><\/td>\r\n<td><strong>9\/10<\/strong><\/td>\r\n<td>Modern infotainment, large displays, built-in Google, and especially a full camera system that transforms both driving and towing.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>Active Safety<\/strong><\/td>\r\n<td><strong>9\/10<\/strong><\/td>\r\n<td>Automatic braking, lane-keeping assist, multiple alerts, and advanced driver aids make it one of the most confidence-inspiring heavy-duty trucks to operate.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>Off-Road \/ Jobsite Capability<\/strong><\/td>\r\n<td><strong>8.5\/10<\/strong><\/td>\r\n<td>The AT4 package \u2014 featuring a lifted suspension, skid plates, and all-terrain tires \u2014 allows it to go where many HD trucks hesitate.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>Interior Quality \/ Fit &amp; Finish<\/strong><\/td>\r\n<td><strong>8.5\/10<\/strong><\/td>\r\n<td>Very solid, well assembled, and modern, although some plastics still remind you of its work-truck DNA.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>Turning Radius \/ Maneuverability<\/strong><\/td>\r\n<td><strong>6.5\/10<\/strong><\/td>\r\n<td>HD proportions require space to maneuver, especially in urban environments or tight parking lots.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>Fuel Economy \/ Efficiency<\/strong><\/td>\r\n<td><strong>7.5\/10<\/strong><\/td>\r\n<td>For a diesel HD, fuel management is respectable \u2014 particularly while towing \u2014 but this is not an economy-focused truck by nature.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>Performance \/ Utility Value<\/strong><\/td>\r\n<td><strong>9\/10<\/strong><\/td>\r\n<td>For buyers with genuine heavy-duty needs, it\u2019s an exceptional tool that fully justifies its size and price.<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<h2><span class=\"ez-toc-section\" id=\"Useful_Links\"><\/span>Useful Links<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<strong>1. Official GMC Sierra 2500HD AT4 Page (GMC US)<\/strong>\r\nDetailed information on features, towing capabilities, and available options.\r\n<a href=\"https:\/\/www.gmc.com\/trucks\/sierra\/2500hd-3500hd\/at4\" target=\"_blank\" rel=\"noopener\">\r\nhttps:\/\/www.gmc.com\/trucks\/sierra\/2500hd-3500hd\/at4\r\n<\/a>\r\n\r\n<strong>2. Detailed Specifications for the 2026 Sierra 2500HD (Canada)<\/strong>\r\nOfficial figures for capability, payload, and towing ratings for the AT4 in Canada.\r\n<a href=\"https:\/\/www.gmccanada.ca\/content\/gmc\/na\/us\/en\/index\/trucks\/sierra\/2500hd-3500hd\/features.html\" target=\"_blank\" rel=\"noopener\">\r\nhttps:\/\/www.gmccanada.ca\/content\/gmc\/na\/us\/en\/index\/trucks\/sierra\/2500hd-3500hd\/features.html\r\n<\/a>\r\n\r\n<strong>3. 2026 GMC Sierra HD Trim Selector (Canada)<\/strong>\r\nCompare trims such as Pro, SLT, AT4, and Denali, and access full technical specifications.\r\n<a href=\"https:\/\/www.gmccanada.ca\/en\/trucks\/2026-sierra-2500hd-3500hd\" target=\"_blank\" rel=\"noopener\">\r\nhttps:\/\/www.gmccanada.ca\/en\/trucks\/2026-sierra-2500hd-3500hd\r\n<\/a>\r\n\r\n\r\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Foire_aux_questions_FAQ\"><\/span>Foire aux questions (FAQ)<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n\r\n\r\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-jnnoltjk\"><strong class=\"schema-faq-question\">What is the towing capacity of the 2026 GMC Sierra 2500HD AT4 Diesel?<\/strong><p class=\"schema-faq-answer\">The 2026 GMC Sierra 2500HD equipped with the Duramax 6.6L V8 diesel can tow up to 18,510 lbs (approximately 8,400 kg) when properly configured. This class-leading figure makes it one of the most capable heavy-duty trucks on the Canadian market.<\/p><\/div><div class=\"schema-faq-section\" id=\"faq-question-frit230p\"><strong class=\"schema-faq-question\">How much does the 2026 GMC Sierra 2500HD AT4 Diesel cost in Canada?<\/strong><p class=\"schema-faq-answer\">The 2026 GMC Sierra 2500HD AT4 with Duramax diesel typically starts around $75,000\u2013$85,000 CAD before taxes. Fully optioned with the Denali trim or additional packages, prices can exceed $95,000 CAD.<\/p><\/div><div class=\"schema-faq-section\" id=\"faq-question-cdncyhm3\"><strong class=\"schema-faq-question\">Is the Duramax diesel better than the Ford Power Stroke for heavy towing?<\/strong><p class=\"schema-faq-answer\">Both engines are exceptional. The Duramax 6.6L L5P produces 470 hp and 975 lb-ft of torque, while Ford&rsquo;s Power Stroke 6.7L produces up to 500 hp and 1,200 lb-ft. For maximum towing, Ford edges ahead on specs, but both are excellent in real-world use. Reliability records are comparable.<\/p><\/div><div class=\"schema-faq-section\" id=\"faq-question-phtmhr9y\"><strong class=\"schema-faq-question\">Does the 2026 Sierra 2500HD AT4 handle well in Canadian winters?<\/strong><p class=\"schema-faq-answer\">Yes. The Sierra 2500HD AT4 comes with GM&rsquo;s Autotrack II four-wheel drive system and an available Snow Mode. The diesel engine&rsquo;s high torque output at low RPM is particularly beneficial in winter conditions. Ensure winter-rated diesel fuel is used below -20\u00b0C.<\/p><\/div><div class=\"schema-faq-section\" id=\"faq-question-r4ncx0yx\"><strong class=\"schema-faq-question\">What makes the AT4 different from the AT4X on the Sierra 2500HD?<\/strong><p class=\"schema-faq-answer\">The AT4 offers off-road-ready features including Rancho shocks, a spray-on bedliner, and skid plates. The AT4X adds Multimatic DSSV dampers, Eaton front locking differential, and more aggressive all-terrain tires \u2014 designed for serious off-road use beyond the AT4&rsquo;s capability.<\/p><\/div><\/div>\r\n","protected":false},"excerpt":{"rendered":"<p>The ultimate guide to a truck built for real heavy-duty work The 2026 GMC Sierra 2500 AT4 Diesel isn\u2019t just a truck: it\u2019s a modern work beast, capable of hauling and towing massive loads while delivering premium-grade technology and safety. On paper, this HD truck is impressive. On the road and on the jobsite, it [&hellip;]<\/p>\n","protected":false},"author":127,"featured_media":58267,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3269,3143,2270],"tags":[3155,3181,3248],"sp_smart_badges":[],"class_list":["post-58303","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-gmc-en-manufacturers-en","category-manufacturers-en","category-reviews","tag-2026-en","tag-gmc-en","tag-sierra-en"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.4 (Yoast SEO v28.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>2026 GMC Sierra 2500HD AT4 Diesel Review | TonCamion.com<\/title>\n<meta name=\"description\" content=\"2026 GMC Sierra 2500HD AT4 diesel review: 470 hp Duramax 6.6L, 18,500 lb towing, off-road capability and premium interior. 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