There are 8 choices

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4x2
- 3.21 ratio (opt HC8)
- 3.42 axle ratio (opt GU6)
- 3.73 ratio (opt GT4)
- 4.10 ratio (opt GT5)
- 4.56 ratio (opt HC4)
4x4

Rear Axle Assembly for 1979 GMC C2500 Suburban

Fits: 4x2 3.21 ratio opt HC8 (change)

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