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3.21 ratio (opt HC8)
3.23 ratio (opt GU5)
3.42 axle ratio (opt GU6)
3.73 ratio (opt GT4)
4.10 ratio (opt GT5)

Front Axle Assembly for 1973 GMC C25/C2500 Pickup

Fits: 3.73 ratio opt GT4 (change)

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