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4x2
- Crew Cab
- Excluding Crew Cab
  - full-floating
  - semi-floating
    - 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 1981 Chevrolet C20 Pickup

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

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