This GMC SIERRA 2500HD delivers a Turbocharged Diesel V8 6.6L/403 engine powering this Automatic transmission. WORK TRUCK PREFERRED EQUIPMENT GROUP includes standard equipment, WHEELS, 17 (43.2 CM) STEEL includes 17 x 7.5 (43.2 cm x 19.1 cm) steel spare wheel. (STD), TRANSMISSION, ALLISON 1000 6-SPEED AUTOMATIC, ELECTRONICALLY CONTROLLED with overdrive, electronic engine grade braking and tow/haul mode.*This GMC SIERRA 2500HD Comes Equipped with These Options *SUSPENSION PACKAGE, HANDLING/TRAILERING, HEAVY-DUTY includes 51mm twin tube shock absorbers and 33mm front stabilizer bar (STD), SIERRA CONVENIENCE PACKAGE includes (DL8) outside heated power-adjustable mirrors, (AQQ) Remote Keyless Entry, (A91) remote locking tailgate, (KI4) 110-volt AC power outlet, (UF2) LED cargo box lighting and (AKO) deep tinted glass; Regular Cab also includes (A31) power windows, TRAILER BRAKE CONTROLLER, INTEGRATED, TIRES, LT245/75R17E ALL-SEASON, BLACKWALL (STD), SUMMIT WHITE, SPARE TIRE DELETE Deletes the spare tire only. Spare wheel and carrier remain., SEATS, FRONT 40/20/40 SPLIT-BENCH, 3-PASSENGER, DRIVER AND FRONT PASSENGER RECLINE with outboard head restraints and center fold-down armrest with storage. Vinyl has fixed lumbar and cloth has manually adjustable driver lumbar. (STD), REMOTE KEYLESS ENTRY, REAR AXLE, 3.73 RATIO, POWER OUTLET, 110-VOLT AC.