This GMC Sierra 2500HD delivers a Turbocharged Diesel V8 6.6L/403 engine powering this Automatic transmission. ENGINE, DURAMAX 6.6L TURBO-DIESEL V8, B20-DIESEL COMPATIBLE, Windows, power with driver express up and down and express down on all other windows (Standard on Crew Cab and Double Cab. On Regular Cab, included and only available with (PDD) Sierra Convenience Package.) (Standard on Crew Cab and Double Cab. On Regular Cab, included and only available with (PDD) Sierra Convenience Package (Double Cab and Regular Cab).), Wheels, 18' (45.7 cm) chromed aluminum includes 18' x 8' (45.7 cm x 20.3 cm) steel spare wheel. Spare not included with (ZW9) pickup box delete unless a spare tire is ordered.. This GMC Sierra 2500HD Comes Equipped with These Options Wheel, 18' x 8' (45.7 cm x 20.3 cm) full-size, steel spare Spare not included with (ZW9) pickup box delete unless a spare tire is ordered. (Requires 18' or 20' wheels and tires.), Visors, driver and front passenger illuminated vanity mirrors, Transmission, 6-speed automatic, heavy-duty, electronically controlled with overdrive and tow/haul mode. Includes Cruise Grade Braking and Powertrain Grade Braking (Requires (L96) Vortec 6.0L V8 SFI engine or (LC8) 6.0L V8 SFI Gaseous CNG/LPG capable engine.), Transfer case, electronic shift with rotary dial controls (Requires 4WD models.), Trailering equipment Trailering hitch platform 2.5' with a 2.0' insert for HD, 7-wire harness with independent fused trailering circuits mated to a 7-way sealed connector to hook up parking lamps, backup lamps, right and left turn signals, an electric brake lead, battery and a ground, The trailer connector also includes the 4-way for use on trailers without brakes - park, brake/turn lamps (Deleted when (ZW9) pickup box delete or (9J4) rear bumper delete is ordered.), Trailer brake controller, integrated (Standard with (E63) pickup box.), Tires, LT265/70R18E all-season, blackwall, Tire Pressure Monitoring System (does not apply to spare tire