2012 GMC Sierra 3500HD Work Truck 4WD Dually Diesel

Rear axle, 3.73 ratio (Not available with (L96) Vortec 6.0L V8 SFI engine on TC30903 with Single Rear Wheels.)

Suspension Package, Handling/Trailering, heavy-duty includes 35mm monotube shocks and 34mm front stabilizer bar

Air cleaner, high-capacity

Transfer case, with floor-mounted shifter (Requires 4WD models)

Differential, heavy-duty automatic locking rear

Four wheel drive

Trailering equipment, heavy-duty includes trailering hitch platform and 2.5- inch receiver with 2" adapter, 7-wire harness (harness includes wires for: park lamps, backup lamps, right turn, left turn, electric brake lead, battery and ground) with independent fused trailering circuits mated to a 7-way sealed connector, wiring harness for after-market trailer brake controller (located in the instrument panel harness) and (JL1) integrated trailer brake controller (Will be deleted if (ZW9) pickup box delete or (VF7) rear bumper delete is ordered.)

Cooling, auxiliary external transmission oil cooler heavy-duty air-to-oil

Cooling, external engine oil cooler heavy-duty air-to-oil, integral to driver side of radiator tank

Battery, heavy-duty 600 cold-cranking amps, maintenance-free with rundown protection and retained accessory power

Alternator, 125 amps

Trailer brake controller, integrated

Recovery hooks, front, frame-mounted

Frame, fully-boxed, hydroformed front section

Suspension, front independent, torsion bar

Suspension, rear 4+1+2 multi-leaf springs for single rear wheel and 3+1+2 multi-leaf springs for dual rear wheel

Steering, power, recirculating ball

Exhaust, aluminized stainless-steel muffler and tailpipe

Pickup box, Wideside

Tire carrier, outside spare, winch-type mounted under frame at rear (Orders with (ZW9) Pickup box delete will not include a Spare Tire Carrier unless a spare tire is ordered.)

Spare tire lock keyed cylinder lock that utilizes same key as ignition and door (Not included when (ZW9) pickup box delete or (VF7) rear bumper delete is ordered.)

Bumper, front chrome includes body-color bumper top caps

Bumper, rear chrome, step-style with pad (Not available with (ZW9) pickup box delete)

Grille, chrome surround

Headlamps, dual halogen composite with automatic exterior lamp control and flash-to-pass feature

Lamps, dual cargo area lamps

Mirrors, outside high-visibility vertical camper-style, Black with manual folding and extension and lower convex spotter glass

Glass, Solar-Ray light-tinted, all windows

Wipers, front intermittent wet-arm with pulse washers

Tailgate protection top of tailgate protection cap

SiriusXM Satellite Radio, delete

Audio system feature, speaker system (Included with (5B5) power windows, doors and locks, SEO. Includes 4 speakers on Regular Cab models and 6 speakers on Extended and Crew Cab models.)

Seat, rear 60/40 folding bench (folds up), 3-passenger, folding (includes child seat top tether anchor) (Requires Crew Cab models)

Floor covering, Black rubberized vinyl

Steering wheel includes theft-deterrent locking feature

Steering column, Tilt-Wheel, adjustable with brake/transmission shift interlock

Instrumentation, analog with speedometer, fuel level, engine temperature, tachometer, voltmeter and oil pressure indicators

Driver Information Center with odometer, trip odometer and message center (monitors numerous systems depending on vehicle equipment level including low fuel, turn signal "on", transmission temperature and oil change notification) (Driver Information Center controls are operated through the trip button unless (UK3) steering wheel mounted audio controls is ordered. On 3SA and 4SA, includes 8-point compass and outside temperature.)

Warning tones headlamp on, key-in-ignition, driver and passenger buckle up reminder and turn signal on

Cruise control, electronic with set and resume speed, located on steering wheel

Air conditioning, single-zone manual front climate control

Cup holders, front (Also includes rear cupholders on Extended and Crew Cab models)

Mirror, inside rearview manual day/night

Headliner, Opal Gray-colored cloth with matching retainer moldings

Visors, driver and front passenger, sliding with clip and passenger side vanity mirror with cover, Opal Gray-colored

Assist handle, front passenger (Also includes rear assist handles in the headliner on Extended and Crew Cab models)

Lighting, interior with dome and reading lights, illuminated entry feature and backlit instrument panel switches

Coat hooks, rear driver and passenger side

Daytime Running Lamps with automatic exterior lamp control

Air bags, frontal, driver and right-front passenger (Always use safety belts and the correct child restraints for your child's age and size, even in vehicles equipped with air bags. Children are safer when properly secured in a rear seat. See the Owner's Manual and child safety seat instructions for more safety information.)

OnStar, delete

Door locks, rear child security (Crew Cab models only.)