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4x2
- Crew Cab
- Excluding Crew Cab
  - 3.21 ratio (opt HC8)
  - 3.42 axle ratio (opt GU6)
  - 3.73 ratio (opt GT4)
  - 4.10 ratio (opt GT5)
  - 4.56 ratio (opt HC4)
4x4

Rear Axle Assembly for 1975 GMC C25

Fits: 4x2 Excluding Crew Cab 3.42 axle ratio opt GU6 (change)

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