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Powered by a 6.2 Liter EcoTec3 V8 generating 420hp paired to a 10 Speed Automatic transmission. This Four Wheel Drive truck is ready to tow and haul with terrific strength returning nearly 20mpg on the highway and it boasts a premium suspension with adaptive ride control. You'll also appreciate the Denali-specific design details which include LED lighting fog lamps 20-inch alloy wheels a power sunroof chrome assist steps a spray-on bed liner hitch receiver and the upscale functionality of a ProGrade Trailering System and MultiPro tailgate.<br><br>High-end luxury awaits in our carefully crafted Denali cabin with leather heatedventilated front seats heated rear seats a heated leather steering wheel dual-zone automatic climate control keyless openignition and 12V120V power outlets. You can master every mile with smart technology too including an 8-inch touchscreen full-color navigation wireless Android Auto??Apple CarPlay?? WiFi compatibility Bluetooth?? wireless charging and a Bose audio system.<br><br>GMC helps you move with confidence backed by safety features from the Driver Alert II Package including adaptive cruise control forward collision alert and lane keep assist alongside an HD rearview camera blind-spot alert lane-change alert parking sensors stabilitytraction control trailer sway control and hill-start assist. Achieve more every day in our precisely engineered Sierra 1500 Denali! 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":"Navigation System"},{"@type":"PropertyValue","name":"feature","value":"Denali 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":"Preferred Equipment Group 5SA"},{"@type":"PropertyValue","name":"feature","value":"Trailering Package"},{"@type":"PropertyValue","name":"feature","value":"7 Speakers"},{"@type":"PropertyValue","name":"feature","value":"AM/FM radio: SiriusXM with 360L"},{"@type":"PropertyValue","name":"feature","value":"Not Equipped w/HD Radio"},{"@type":"PropertyValue","name":"feature","value":"Premium audio system: GMC Infotainment System"},{"@type":"PropertyValue","name":"feature","value":"Premiu"}],"image":[{"@type":"ImageObject","url":"https://imgcdn.lotlinx.com/vdn/92945/gmc_sierra%201500_2021_3GTU9FEL6MG480690_92945_2746475689.jpg?ver=20260807","description":"2021 GMC Sierra 1500 - 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":"2021-gmc-sierra-1500-unknown","dateCreated":"2026-08-16T10:34:46.477Z","dateModified":"2026-08-17T10:34:42.083Z","safetyRating":{"source":"NHTSA","program":"5-Star Safety Ratings (NCAP)","sourceUrl":"https://www.nhtsa.gov/ratings","nhtsaVehicleId":15360,"vehicleDescription":"2021 GMC Sierra 1500 PU/RC 4WD","overall":"5","overallFront":"4","frontalDriver":"5","frontalPassenger":"4","overallSide":"5","sideDriver":"5","sidePassenger":"Not Rated","sidePole":"5","rollover":"4","rolloverPossibility":0.198,"adas":{"electronicStabilityControl":"Standard","forwardCollisionWarning":"Optional","laneDepartureWarning":"No"},"fetchedAt":"2026-07-30T06:03:01.302Z"},"recallSummary":{"source":"NHTSA","scope":"year_make_model","openRecallCount":7,"hasOpenRecalls":true,"hasParkIt":false,"hasParkOutside":false,"fetchedAt":"2026-08-17T12:00:14.435Z"},"referenceSpecs":{"source":"manufacturer_reference","trimName":"Denali","description":"Denali 4dr Crew Cab 4WD 5.8 ft. 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