2013 GMC Sierra 3500HD 4X4 Denali

Door locks, power
Air conditioning, dual-zone automatic climate control with individual climate settings for driver and right-front passenger
Assist handles, front passenger and rear outboard
Rear Parking Assist, Ultrasonic with audible warning
Seat, rear 60/40 folding bench (folds up), 3-passenger, folding (includes child seat top tether anchor)
Cup holders, in console and rear
Defogger, rear-window electric (Not available with (A48) power sliding rear window.)
Seat adjuster, front passenger 12-way power
Headliner, Opal Gray-colored cloth with matching retainer moldings
Cruise control, electronic with set and resume speed
Lighting, interior with dome and reading lights, illuminated entry feature and blue backlit instrument panel switches
MECHANICAL
Trailer brake controller, integrated
Air cleaner, high-capacity
Cooling, auxiliary external transmission oil cooler, heavy-duty air-to-oil
Alternator, 125 amps
Suspension, front independent, torsion bar
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.)
Transfer case, electronic shift with rotary dial controls (Requires 4WD models)
Trailering equipment, heavy-duty includes trailering hitch platform, 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 and instrument panel jumper wiring harness for electric trailer brake controller
Frame, fully-boxed, hydroformed front section
Differential, heavy-duty automatic locking rear
Recovery hooks, front, Black
Engine, Vortec 6.0L Variable Valve Timing V8 SFI E85-compatible, FlexFuel capable of running on unleaded or up to 85% ethanol (360 hp [268.4 kW] @ 5400 rpm, 380 lb-ft of torque [513.0 N-m] @ 4200 rpm)
Exhaust, aluminized stainless-steel muffler and tailpipe
Pickup box, Wideside
Skid Plate Package includes front underbody shield starting behind front bumper and running to first cross-member, protecting front underbody, oil pan, differential case and transfer case, frame-mounted shields
Battery, heavy-duty 600 cold-cranking amps, maintenance-free with rundown protection and retained accessory power
Brakes, 4-wheel antilock, 4-wheel disc (Standard on T*30943 models only.)
Cooling, external engine oil cooler, heavy-duty air-to-oil integral to driver side of radiator tank
Steering, power
Four wheel drive
Suspension, rear 4+1+2 multi-leaf springs for single rear wheel and 3+1+2 multi-leaf springs for dual rear wheel
Suspension Package, Handling/Trailering, heavy-duty includes 35mm twin tube shock absorbers and 36mm front stabilizer bar
Rear axle, 3.73 ratio
GVWR, 13,025 lbs. (5908 kg) with dual rear wheels (Requires T*30943 models.)
SAFETY
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 in the appropriate infant, child or booster seat. See the Owner's Manual and child safety seat instructions for more safety information.)
Door locks, rear child security
Automatic Crash Response
Rear Vision Camera (Note: images appear on Navigation screen for units equipped with (UYS) AM/FM stereo with MP3 compatible CD/DVD player and navigation. For units not equipped with Navigation systems images will appear within rearview mirror.)
Rear Vision Camera (Note: images appear on Navigation screen for units equipped with (UYS) AM/FM stereo with MP3 compatible CD/DVD player and navigation).
Stolen Vehicle Assistance
Daytime Running Lamps with automatic exterior lamp control