This GMC Sierra 2500HD delivers a Turbocharged Diesel V8 6.6L/ engine powering this Automatic transmission. WHEELS, 20 (50.8 CM) ULTRA-BRIGHT MACHINED ALUMINUM WHEELS, TRANSMISSION, ALLISON 10-SPEED AUTOMATIC, TIRES, LT275/65R20 ALL-TERRAIN, BLACKWALL.* This GMC Sierra 2500HD Features the Following Options *MAX TRAILERING PACKAGE, GOOSENECK / 5TH WHEEL PREP PACKAGE -- HITCH PLATFORM TO ACCEPT GOOSENECK OR 5TH WHEEL HITCH. , SEATS, FRONT BUCKET, REAR AXLE, 3.42 RATIO, LPO, GMC MULTIPRO TAILGATE STEP LIGHTS, LPO, FRONT AND REAR MOLDED SPLASH GUARDS, BLACK, LPO, CARGO TIE-DOWN RINGS, SET OF 4, LICENSE PLATE KIT, FRONT, INCANDESCENT LIGHTING, GVWR, 11,750 LBS. (5330 KG), ENGINE, DURAMAX 6.6L TURBO-DIESEL V8, B20-DIESEL COMPATIBLE.