This GMC Sierra 3500HD boasts a Turbocharged Diesel V8 6.6L/403 engine powering this Automatic transmission. WHEELS, 18 TRANSMISSION, ALLISON 1000 6-SPEED AUTOMATIC, ELECTRONICALLY CONTROLLED with overdrive, electronic engine grade braking and tow/haul mode, TRAILERING WIRING PROVISIONS, FOR CAMPER, FIFTH WHEEL AND GOOSENECK TRAILER includes additional 7-way wiring harness routed to front of pickup box.*This GMC Sierra 3500HD Comes Equipped with These Options *SUSPENSION PACKAGE, HANDLING/TRAILERING, HEAVY-DUTY includes 35mm monotube shocks and 34mm front stabilizer bar (STD), SNOW PLOW PREP PACKAGE includes 10-amp power for backup and roof emergency light, forward lamp wiring harness, (TRW) Provision for cab roof mounted lamp/beacon, instrument panel jumper wiring harness for electric trailer brake controller, (NZZ) Skid Plate Package and increased Front Gross Axle Weight Rating, SKID PLATE PACKAGE, FRAME-MOUNTED SHIELDS includes front underbody shield starting behind front bumper and running to first cross-member, protecting front underbody, oil pan, differential case and transfer case , TIRES, LT265/70R18E ALL-TERRAIN, BLACKWALL, TIRE, SPARE LT265/70R18E ALL-TERRAIN, BLACKWALL, SWITCH, HIGH IDLE, STEALTH GRAY METALLIC, STABILITRAK, STABILITY CONTROL SYSTEM WITH PROACTIVE ROLL AVOIDANCE AND TRACTION CONTROL includes electronic trailer sway control and hill start assist, SLT PREFERRED EQUIPMENT GROUP Includes Standard Equipment, SEATS, HEATED AND COOLED DRIVER AND FRONT PASSENGER FRONT BUCKET includes 12-way power driver and front passenger seat adjusters including 4-way power lumbar control, 2-position driver memory, adjustable head restraints, floor console and storage pockets.*The Experts' Verdict...*As reported by KBB.com: If you need to haul big payloads exceeding 10,000 pounds or conventionally tow up to 18,000 pounds, the 2014 GMC Sierra HD has you covered. The Denali trim should hold special appeal for those who use their work truck as a daily driver.*Visit Us Today *Stop by Nimnicht Buick GMC located at 11503 Philips Hwy, Jacksonville, FL 32256 for a quick visit and a great vehicle!