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Motivated by a TurboCharged 6.6 Liter DuraMax Diesel V8 delivering 401hp to a 10 Speed Allison Automatic transmission. This Four Wheel Drive provides impressive trail capability with skid plates terrain management and an off-road suspension complete with Rancho shocks and it has a ProGrade Trailering System to simplify towing and hauling. Bold good looks come into play with LED lighting fog lamps red recovery hooks a power sunroof a spray-on bed liner a tonneau cover a MultiPro tailgate and our Premium Pack for 20-inch black alloy wheels and black assist steps.<br><br>Upscale luxury greets you in our AT4 cabin with heatedventilated leather power front and heated rear seats a heated leather steering wheel dual-zone automatic climate control cruise control keyless openstart and our Preferred Pack for wireless charging a power rear window full-color navigation rear DVD entertainment system and Bose audio. Standard tech highlights include an 8-inch touchscreen Android Auto??Apple CarPlay?? Bluetooth?? and WiFi compatibility.<br><br>GMC helps you keep out of harm's way with our Premium Pack which adds blind-spot monitoring frontrear parking sensors rear cross-traffic alert and lane-departure alert to an HD rear camera hill-descent control hill-start assistance and more. Rugged yet refined our Sierra 3500 AT4 is ready to rock! Save this Page and Call for Availability. We Know You Will Enjoy Your Test Drive Towards Ownership!<br><br>www.corwinmotorskalispell.com Excellent selection of Used Vehicles Financing Options serving Kalispell Missoula Butte Bozeman Great Fall Helena Havre Cut Bank Libby Ronan Polson Flathead County Lake County Mineral County Lincoln County and Glacier Park. KALISPELL MONTANA CORWIN MOTORS of KALISPELL.","additionalProperty":[{"@type":"PropertyValue","name":"feature","value":"AT4 Preferred Package"},{"@type":"PropertyValue","name":"feature","value":"AT4 Premium Package"},{"@type":"PropertyValue","name":"feature","value":"Driver Alert Package I"},{"@type":"PropertyValue","name":"feature","value":"Driver Alert Package II"},{"@type":"PropertyValue","name":"feature","value":"Gooseneck/5th Wheel Package"},{"@type":"PropertyValue","name":"feature","value":"Gooseneck/5th Wheel Prep Package"},{"@type":"PropertyValue","name":"feature","value":"Preferred Equipment Group 4SB"},{"@type":"PropertyValue","name":"feature","value":"Technology Package"},{"@type":"PropertyValue","name":"feature","value":"X31 Off-Road Package"},{"@type":"PropertyValue","name":"feature","value":"6 Speakers"},{"@type":"PropertyValue","name":"feature","value":"6-Speaker Audio System Fe"}],"image":[{"@type":"ImageObject","url":"https://imgcdn.lotlinx.com/vdn/92945/gmc_sierra%203500hd_0_1GT49VEYXLF281325_92945_2742003130.jpg?ver=20260724","description":"2020 GMC Sierra 3500HD - Primary exterior view","representativeOfPage":true}],"seller":{"@type":"AutoDealer","name":"Corwin Motors Kalispell GMC","slug":"corwin-motors-chevrolet-gmc-of-kalispell-kalispell-mt","telephone":null,"url":null,"address":{"@type":"PostalAddress","postalCode":"59901","addressRegion":"MT","streetAddress":"2565 U.S. 93","addressCountry":"US","addressLocality":"Kalispell"},"latitude":"48.2416000","longitude":"-114.3290000","dealerGroup":null,"aggregateRating":{"@type":"AggregateRating","ratingValue":4.3,"reviewCount":2461,"bestRating":5,"worstRating":1}},"stockNumber":null,"slug":"2020-gmc-sierra-3500hd-unknown","dateCreated":"2026-08-05T10:35:27.500Z","dateModified":"2026-08-05T10:35:27.495Z","safetyRating":null,"recallSummary":null,"referenceSpecs":null,"inventoryStatus":"on_lot","estimatedArrival":null,"_raw":{"lot_date":"2026-07-21"},"isFeatured":false,"internetprice":48751,"msrp":null}