There are 16 choices

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4x2
- 5.0L
- 5.7L
4x4
- 5.0L
  - 10 bolt cover
    - 3.42 axle ratio (opt GU6)
    - 3.73 ratio (opt GT4)
  - 14 bolt cover
    - 3.42 axle ratio (opt GU6)
    - 3.73 ratio (opt GT4)
- 5.7L
  - 10 bolt cover
    - 3.42 axle ratio (opt GU6)
    - 3.73 ratio (opt GT4)
  - 14 bolt cover
    - 3.42 axle ratio (opt GU6)
    - 3.73 ratio (opt GT4)

Rear Axle Assembly for 1999 GMC K1500 Pickup

Fits: 4x4 5.7L 14 bolt cover 3.42 axle ratio opt GU6 (change)

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