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

Rear Axle Assembly for 1990 GMC K2500 Pickup

Fits: 4x2 semi-floating 8 lug wheel auxiliary spring 4.10 ratio opt GT5 (change)

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