Our Diesel powered 2021 GMC Sierra 3500 SLT Crew Cab 4X4 is impressively well equipped for working harder with a bold Onyx Black design! Motivated by a TurboCharged 6.6 Litre DuraMax Diesel V8 serving up 445hp and 910lb-ft of torque paired to a 10 Speed Allison Automatic transmission for awesome strength. This Four Wheel Drive truck also rides on a specially tuned suspension to support its massive GVWR, and it features a ProGrade Trailering System to make towing especially easy. A commanding presence, our Sierra stands tall with LED lighting, fog lamps, chrome accents, alloy wheels, and a six-function MultiPro tailgate. Every day can be more comfortable in our SLT's cabin that showcases heated leather power front seats, a heated leather steering wheel, dual-zone automatic climate control, remote start, and a Premium GMC Infotainment System. Thanks to that smart setup, you can stay connected with an 8-inch touchscreen, Apple CarPlay, Android Auto, WiFi compatibility, and Bluetooth, all while listening to a six-speaker sound system with HD Radio and available satellite radio. GMC safeguards your busiest days with a high-strength steel frame that's complemented by an HD backup camera, a rear-seat reminder, ABS, hitch guidance, StabiliTrak stability/traction control, tire-pressure monitoring, and more. Our Sierra 3500 SLT carries the weight of your world with ease! Save this Page and Call for Availability. We Know You Will Enjoy Your Test Drive Towards Ownership. Drive a Little, Save a Lot. Really Experience the Murray Difference.