2011 GMC Sierra 1500 Denali

Suspension Package, High-Performance includes 36mm front stabilizer bar
Suspension, rear 2-stage multi-leaf springs, semi-elliptic
Transfer case, AWD, electronic automatic system (Requires TK10543 models.)
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
Suspension, front coil-over-shock with stabilizer bar
Cooling, external engine oil cooler heavy-duty air-to-oil, integral to driver side of radiator tank
Steering, power
Exhaust, aluminized stainless-steel muffler and tailpipe
Frame, fully-boxed, hydroformed front section
Differential, heavy-duty automatic locking rear
Cooling auxiliary external transmission oil cooler, heavy-duty air-to-oil
Brakes, 4-wheel antilock, 4-wheel disc
All wheel drive
Alternator, 145 amps
Tools, mechanical jack and wheel wrench located in back of cab
Transmission, 6-speed automatic, heavy-duty, electronically controlled with overdrive and tow/haul mode
Cooling external engine oil cooler, heavy-duty air-to-oil, integral to driver side of radiator tank
PACKAGE
Trailering Package, 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
SAFETY
Tire Pressure Monitor System (does not apply to spare tire)
Air bags, frontal, driver and right-front passenger with Passenger Sensing System (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.)
StabiliTrak, stability control system with Proactive Roll Avoidance, includes electronic trailer sway control, intelligent brake assist and hill start assist
Rear Parking Assist, Ultrasonic with audible warning
OnStar Turn-by-Turn Navigation
Air bags, head curtain side-impact, front and rear outboard seating positions with rollover sensor (Head curtain side air bags are designed to help reduce the risk of head and neck injuries to front and rear seat outboard occupants on the near side of certain side-impact collisions. 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.)
Daytime Running Lamps with automatic exterior lamp control
Automatic Crash Response
Stolen Vehicle Assistance
Door locks, rear child security. (Crew Cab models only.)
Air bags, seat-mounted side-impact, driver and right-front passenger for thorax and pelvic protection (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.)
OnStar, 6 months of Directions and Connections plan includes Automatic Crash Response, Emergency Services, Crisis Assist, Stolen Vehicle Assistance including Remote Ignition Block, Remote Door Unlock (requires power locks), Turn-by-Turn Navigation with Destination Download (requires navigation radio) and OnStar eNav (where available), OnStar Vehicle Diagnostics, Roadside Assistance, Remote Horn and Lights, and Hands Free Calling. (Not available with a ship-to of Puerto Rico or the Virgin Islands. Visit onstar.com for details and system limitations.)