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ABS
- (left hand firewall)
  - (rear wheel ABS)
Cruise Control
- (left hand firewall)
  - model VIN C/K (5th digit)
  - model VIN R/V (5th digit)
    - diesel
    - gasoline
Transmission
- (diesel, Passenger Side side dash)

Chassis Computer for 1991 GMC C3500 Pickup

Fits: Cruise Control left hand firewall model VIN R/V 5th digit diesel (change)

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