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5.0L
- 3.42 axle ratio (opt GU6)
- 3.73 ratio (opt GT4)
5.7L
- 3.42 axle ratio (opt GU6)
- 3.73 ratio (opt GT4)

Front Axle Assembly for 1999 GMC C1500 Pickup

Fits: 5.0L 3.73 ratio opt GT4 (change)

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