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 1975 GMC K15

Fits: 3.73 ratio opt GT4 (change)

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