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4x2
- model VIN C (5th digit)
- model VIN R (5th digit)
4x4
- (model VIN K, 5th digit)
  - 3.42 axle ratio (opt GU6)
  - 3.73 ratio (opt GT4)
  - 4.10 ratio (opt GT5)

Rear Axle Assembly for 1988 GMC R2500 Pickup

Fits: 4x4 model VIN K, 5th digit 3.42 axle ratio opt GU6 (change)

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