There are 8 choices

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Air Bag
- (below left hand front seat)
  - Crew Cab
  - Excluding Crew Cab
Body Control (BCM)
- (under steering column)
  - Crew Cab
  - Excluding Crew Cab
Communication
- telematics (OnStar, opt UE1)
  - (Passenger Side dash)
Memory
- (under Driver Side seat)
Transfer Case
- (left hand dash)
Transmission
- (left hand fan shroud)
  - (Automatic Transmission, 5 speed, Allison, opt M74)

Chassis Computer for 2004 GMC Sierra 3500

Fits: Transmission left hand fan shroud Automatic Transmission, 5 speed, Allison, opt M74 (change)

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