There are 11 choices

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4x2
- 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 1977 GMC Jimmy

Fits: 4x2 2.73 ratio opt GU2 (change)

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