There are 17 choices

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Air Bag
- (below left hand front seat)
  - Crew Cab
    - roof air bags (opt ASF)
    - Without roof air bags
  - Extended Cab
    - roof air bags (opt ASF)
    - Without roof air bags
  - Regular Cab
Body Control (BCM)
- (under steering column)
Communication
- telematics (OnStar, opt UE1)
  - (center dash, behind radio)
Driver Side Assist
- (park assist)
  - (below Passenger Side front seat)
Fuel Pump
- (left hand frame rail)
Memory
- (under Driver Side seat)
Towing Control
- (left hand rear frame)
Transfer Case
- (left hand dash)
Transmission
- (next to battery)

Chassis Computer for 2008 GMC Sierra 1500 HD

Fits: Transmission next to battery (change)

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