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4x2
- 10 bolt cover
- 12 bolt cover
  - 2.73 ratio (opt GU2)
  - 3.08 ratio (opt GU4)
  - 3.42 axle ratio (opt GU6)
  - 3.73 ratio (opt GT4)
  - 4.11 ratio (opt GT5)
4x4

Rear Axle Assembly for 1978 GMC K15 Suburban

Fits: 4x2 12 bolt cover 3.42 axle ratio opt GU6 (change)

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