There are 6 choices

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2.56 ratio (opt GM8)
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)

Front Axle Assembly for 1979 GMC P1500

Fits: 2.73 ratio opt GU2 (change)

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