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4x2
- full-floating
- semi-floating
  - 6 lug wheel
  - 8 lug wheel
    - auxiliary spring
    - Without auxiliary spring
4x4
- full-floating
  - 3.42 axle ratio (opt GU6)
  - 3.73 ratio (opt GT4)
  - 4.10 ratio (opt GT5)
  - 4.56 ratio (opt HC4)
- semi-floating
  - 6 lug wheel
  - 8 lug wheel

Rear Axle Assembly for 1990 GMC K2500 Pickup

Fits: 4x4 full-floating 4.56 ratio opt HC4 (change)

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