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Motivated by a TurboCharged 3.0 Liter DuraMax Diesel 6 Cylinder generating 277hp and 460lb-ft of torque paired to a 10 Speed Automatic transmission. This Four Wheel Drive truck pulls with terrific strength it returns nearly 26mpg on the highway and it boasts a premium suspension with adaptive ride control. You'll also appreciate the LED lighting fog lamps a spray-on bed liner a tonneau cover a ProGrade Trailering System a grille guard a MultiPro tailgate and our package's 22-inch alloy wheels sunroof and power assist steps.<br><br>High-end luxury awaits in our carefully crafted Denali cabin with leather heatedventilated front and 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 premium audio system.<br><br>GMC helps you move with confidence backed by safety features like a blind-spot monitor plus our package's surround-view camera head-up display digital rearview mirror emergency braking adaptive cruise control and lane-keeping assistance. 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><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":[],"image":[{"@type":"ImageObject","url":"https://imgcdn.lotlinx.com/vdn/92945/gmc_sierra%201500_2021_1GTU9FET8MZ256580_92945_2739717487.jpg?ver=20260717","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":"2026-08-01T10:39:07.178Z","dateModified":"2026-08-02T10:34:17.190Z","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":"2026-07-27T12:00:42.906Z"},"referenceSpecs":{"source":"manufacturer_reference","trimName":"Denali","description":"Denali 4dr Crew Cab 4WD 5.8 ft. 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