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2500 Pickup Rear Axles

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2000 gmc 2500 pickup Rear Axles

4x2, 5.7L, full-floating, 3.42 axle ratio (opt GU6)
4x2, 5.7L, full-floating, 3.73 ratio (opt GT4)
4x2, 5.7L, full-floating, 4.10 ratio (opt GT5)
4x2, 5.7L, full-floating, 4.56 ratio (opt HC4)
4x2, 5.7L, semi-floating, 3.42 axle ratio (opt GU6)
4x2, 5.7L, semi-floating, 3.73 ratio (opt GT4)
4x2, 5.7L, semi-floating, 4.10 ratio (opt GT5)
4x2, 5.7L, semi-floating, 4.56 ratio (opt HC4)
4x2, 6.5L (turbo diesel), full-floating, 3.42 axle ratio (opt GU6)
4x2, 6.5L (turbo diesel), full-floating, 3.73 ratio (opt GT4)
4x2, 6.5L (turbo diesel), full-floating, 4.10 ratio (opt GT5)
4x2, 6.5L (turbo diesel), full-floating, 4.56 ratio (opt HC4)
4x2, 6.5L (turbo diesel), semi-floating, 3.42 axle ratio (opt GU6)
4x2, 6.5L (turbo diesel), semi-floating, 3.73 ratio (opt GT4)
4x2, 6.5L (turbo diesel), semi-floating, 4.10 ratio (opt GT5)
4x2, 6.5L (turbo diesel), semi-floating, 4.56 ratio (opt HC4)
4x2, 7.4L, full-floating, 3.42 axle ratio (opt GU6)
4x2, 7.4L, full-floating, 3.73 ratio (opt GT4)
4x2, 7.4L, full-floating, 4.10 ratio (opt GT5)
4x2, 7.4L, full-floating, 4.56 ratio (opt HC4)
4x2, 7.4L, semi-floating, 3.42 axle ratio (opt GU6)
4x2, 7.4L, semi-floating, 3.73 ratio (opt GT4)
4x2, 7.4L, semi-floating, 4.10 ratio (opt GT5)
4x2, 7.4L, semi-floating, 4.56 ratio (opt HC4)
4x4, 5.7L, full-floating, 3.42 axle ratio (opt GU6)
4x4, 5.7L, full-floating, 3.73 ratio (opt GT4)
4x4, 5.7L, full-floating, 4.10 ratio (opt GT5)
4x4, 5.7L, full-floating, 4.56 ratio (opt HC4)
4x4, 5.7L, semi-floating, 3.42 axle ratio (opt GU6)
4x4, 5.7L, semi-floating, 3.73 ratio (opt GT4)
4x4, 5.7L, semi-floating, 4.10 ratio (opt GT5)
4x4, 6.5L (turbo diesel), full-floating, 3.42 axle ratio (opt GU6)
4x4, 6.5L (turbo diesel), full-floating, 3.73 ratio (opt GT4)
4x4, 6.5L (turbo diesel), full-floating, 4.10 ratio (opt GT5)
4x4, 6.5L (turbo diesel), full-floating, 4.56 ratio (opt HC4)
4x4, 6.5L (turbo diesel), semi-floating, 3.42 axle ratio (opt GU6)
4x4, 6.5L (turbo diesel), semi-floating, 3.73 ratio (opt GT4)
4x4, 6.5L (turbo diesel), semi-floating, 4.10 ratio (opt GT5)
4x4, 7.4L, full-floating, 3.42 axle ratio (opt GU6)
4x4, 7.4L, full-floating, 3.73 ratio (opt GT4)
4x4, 7.4L, full-floating, 4.10 ratio (opt GT5)
4x4, 7.4L, full-floating, 4.56 ratio (opt HC4)
4x4, 7.4L, semi-floating, 3.42 axle ratio (opt GU6)
4x4, 7.4L, semi-floating, 3.73 ratio (opt GT4)
4x4, 7.4L, semi-floating, 4.10 ratio (opt GT5)

1999 gmc 2500 pickup Rear Axles

4x2, 5.7L, full-floating, 3.42 axle ratio (opt GU6)
4x2, 5.7L, full-floating, 3.73 ratio (opt GT4)
4x2, 5.7L, full-floating, 4.10 ratio (opt GT5)
4x2, 5.7L, full-floating, 4.56 ratio (opt HC4)
4x2, 5.7L, semi-floating, 3.42 axle ratio (opt GU6)
4x2, 5.7L, semi-floating, 3.73 ratio (opt GT4)
4x2, 5.7L, semi-floating, 4.10 ratio (opt GT5)
4x2, 5.7L, semi-floating, 4.56 ratio (opt HC4)
4x2, 6.5L (turbo diesel), full-floating, 3.42 axle ratio (opt GU6)
4x2, 6.5L (turbo diesel), full-floating, 3.73 ratio (opt GT4)
4x2, 6.5L (turbo diesel), full-floating, 4.10 ratio (opt GT5)
4x2, 6.5L (turbo diesel), full-floating, 4.56 ratio (opt HC4)
4x2, 6.5L (turbo diesel), semi-floating, 3.42 axle ratio (opt GU6)
4x2, 6.5L (turbo diesel), semi-floating, 3.73 ratio (opt GT4)
4x2, 6.5L (turbo diesel), semi-floating, 4.10 ratio (opt GT5)
4x2, 6.5L (turbo diesel), semi-floating, 4.56 ratio (opt HC4)
4x2, 7.4L, full-floating, 3.42 axle ratio (opt GU6)
4x2, 7.4L, full-floating, 3.73 ratio (opt GT4)
4x2, 7.4L, full-floating, 4.10 ratio (opt GT5)
4x2, 7.4L, full-floating, 4.56 ratio (opt HC4)
4x2, 7.4L, semi-floating, 3.42 axle ratio (opt GU6)
4x2, 7.4L, semi-floating, 3.73 ratio (opt GT4)
4x2, 7.4L, semi-floating, 4.10 ratio (opt GT5)
4x2, 7.4L, semi-floating, 4.56 ratio (opt HC4)
4x4, 5.7L, full-floating, 3.42 axle ratio (opt GU6)
4x4, 5.7L, full-floating, 3.73 ratio (opt GT4)
4x4, 5.7L, full-floating, 4.10 ratio (opt GT5)
4x4, 5.7L, full-floating, 4.56 ratio (opt HC4)
4x4, 5.7L, semi-floating, 3.42 axle ratio (opt GU6)
4x4, 5.7L, semi-floating, 3.73 ratio (opt GT4)
4x4, 5.7L, semi-floating, 4.10 ratio (opt GT5)
4x4, 6.5L (turbo diesel), full-floating, 3.42 axle ratio (opt GU6)
4x4, 6.5L (turbo diesel), full-floating, 3.73 ratio (opt GT4)
4x4, 6.5L (turbo diesel), full-floating, 4.10 ratio (opt GT5)
4x4, 6.5L (turbo diesel), full-floating, 4.56 ratio (opt HC4)
4x4, 6.5L (turbo diesel), semi-floating, 3.42 axle ratio (opt GU6)
4x4, 6.5L (turbo diesel), semi-floating, 3.73 ratio (opt GT4)
4x4, 6.5L (turbo diesel), semi-floating, 4.10 ratio (opt GT5)
4x4, 7.4L, full-floating, 3.42 axle ratio (opt GU6)
4x4, 7.4L, full-floating, 3.73 ratio (opt GT4)
4x4, 7.4L, full-floating, 4.10 ratio (opt GT5)
4x4, 7.4L, full-floating, 4.56 ratio (opt HC4)
4x4, 7.4L, semi-floating, 3.42 axle ratio (opt GU6)
4x4, 7.4L, semi-floating, 3.73 ratio (opt GT4)
4x4, 7.4L, semi-floating, 4.10 ratio (opt GT5)

1998 gmc 2500 pickup Rear Axles

4x2, full-floating, 3.42 axle ratio (opt GU6)
4x2, full-floating, 3.73 ratio (opt GT4)
4x2, full-floating, 4.10 ratio (opt GT5)
4x2, full-floating, 4.56 ratio (opt HC4)
4x2, semi-floating, 6 lug wheel, 3.42 axle ratio (opt GU6)
4x2, semi-floating, 6 lug wheel, 3.73 ratio (opt GT4)
4x2, semi-floating, 6 lug wheel, 4.10 ratio (opt GT5)
4x2, semi-floating, 6 lug wheel, 4.56 ratio (opt HC4)
4x2, semi-floating, 8 lug wheel, 3.42 axle ratio (opt GU6)
4x2, semi-floating, 8 lug wheel, 3.73 ratio (opt GT4)
4x2, semi-floating, 8 lug wheel, 4.10 ratio (opt GT5)
4x2, semi-floating, 8 lug wheel, 4.56 ratio (opt HC4)
4x4, full-floating, 3.42 axle ratio (opt GU6)
4x4, full-floating, 3.73 ratio (opt GT4)
4x4, full-floating, 4.10 ratio (opt GT5)
4x4, full-floating, 4.56 ratio (opt HC4)
4x4, semi-floating, 3.42 axle ratio (opt GU6)
4x4, semi-floating, 3.73 ratio (opt GT4)
4x4, semi-floating, 4.10 ratio (opt GT5)

1997 gmc 2500 pickup Rear Axles

4x2, full-floating, 3.42 axle ratio (opt GU6)
4x2, full-floating, 3.73 ratio (opt GT4)
4x2, full-floating, 4.10 ratio (opt GT5)
4x2, full-floating, 4.56 ratio (opt HC4)
4x2, semi-floating, 6 lug wheel, 3.42 axle ratio (opt GU6)
4x2, semi-floating, 6 lug wheel, 3.73 ratio (opt GT4)
4x2, semi-floating, 6 lug wheel, 4.10 ratio (opt GT5)
4x2, semi-floating, 6 lug wheel, 4.56 ratio (opt HC4)
4x2, semi-floating, 8 lug wheel, 3.42 axle ratio (opt GU6)
4x2, semi-floating, 8 lug wheel, 3.73 ratio (opt GT4)
4x2, semi-floating, 8 lug wheel, 4.10 ratio (opt GT5)
4x2, semi-floating, 8 lug wheel, 4.56 ratio (opt HC4)
4x4, full-floating, 3.42 axle ratio (opt GU6)
4x4, full-floating, 3.73 ratio (opt GT4)
4x4, full-floating, 4.10 ratio (opt GT5)
4x4, full-floating, 4.56 ratio (opt HC4)
4x4, semi-floating, 3.42 axle ratio (opt GU6)
4x4, semi-floating, 3.73 ratio (opt GT4)
4x4, semi-floating, 4.10 ratio (opt GT5)

1996 gmc 2500 pickup Rear Axles

4x2, full-floating, 3.42 axle ratio (opt GU6)
4x2, full-floating, 3.73 ratio (opt GT4)
4x2, full-floating, 4.10 ratio (opt GT5)
4x2, full-floating, 4.56 ratio (opt HC4)
4x2, semi-floating, 6 lug wheel, 3.42 axle ratio (opt GU6)
4x2, semi-floating, 6 lug wheel, 3.73 ratio (opt GT4)
4x2, semi-floating, 6 lug wheel, 4.10 ratio (opt GT5)
4x2, semi-floating, 6 lug wheel, 4.56 ratio (opt HC4)
4x2, semi-floating, 8 lug wheel, 3.42 axle ratio (opt GU6)
4x2, semi-floating, 8 lug wheel, 3.73 ratio (opt GT4)
4x2, semi-floating, 8 lug wheel, 4.10 ratio (opt GT5)
4x2, semi-floating, 8 lug wheel, 4.56 ratio (opt HC4)
4x4, full-floating, 3.42 axle ratio (opt GU6)
4x4, full-floating, 3.73 ratio (opt GT4)
4x4, full-floating, 4.10 ratio (opt GT5)
4x4, full-floating, 4.56 ratio (opt HC4)
4x4, semi-floating, 3.42 axle ratio (opt GU6)
4x4, semi-floating, 3.73 ratio (opt GT4)
4x4, semi-floating, 4.10 ratio (opt GT5)

1995 gmc 2500 pickup Rear Axles

4x2, full-floating, 3.42 axle ratio (opt GU6)
4x2, full-floating, 3.73 ratio (opt GT4)
4x2, full-floating, 4.10 ratio (opt GT5)
4x2, full-floating, 4.56 ratio (opt HC4)
4x2, semi-floating, 6 lug wheel, 3.42 axle ratio (opt GU6)
4x2, semi-floating, 6 lug wheel, 3.73 ratio (opt GT4)
4x2, semi-floating, 6 lug wheel, 4.10 ratio (opt GT5)
4x2, semi-floating, 6 lug wheel, 4.56 ratio (opt HC4)
4x2, semi-floating, 8 lug wheel, 3.42 axle ratio (opt GU6)
4x2, semi-floating, 8 lug wheel, 3.73 ratio (opt GT4)
4x2, semi-floating, 8 lug wheel, 4.10 ratio (opt GT5)
4x2, semi-floating, 8 lug wheel, 4.56 ratio (opt HC4)
4x4, full-floating, 3.42 axle ratio (opt GU6)
4x4, full-floating, 3.73 ratio (opt GT4)
4x4, full-floating, 4.10 ratio (opt GT5)
4x4, full-floating, 4.56 ratio (opt HC4)
4x4, semi-floating, 6 lug wheel, 3.42 axle ratio (opt GU6)
4x4, semi-floating, 6 lug wheel, 3.73 ratio (opt GT4)
4x4, semi-floating, 6 lug wheel, 4.10 ratio (opt GT5)
4x4, semi-floating, 8 lug wheel, 3.42 axle ratio (opt GU6)
4x4, semi-floating, 8 lug wheel, 3.73 ratio (opt GT4)
4x4, semi-floating, 8 lug wheel, 4.10 ratio (opt GT5)
4x4, semi-floating, 8 lug wheel, 4.56 ratio (opt HC4)

1994 gmc 2500 pickup Rear Axles

4x2, full-floating, 3.42 axle ratio (opt GU6)
4x2, full-floating, 3.73 ratio (opt GT4)
4x2, full-floating, 4.10 ratio (opt GT5)
4x2, full-floating, 4.56 ratio (opt HC4)
4x2, semi-floating, 6 lug wheel, 3.42 axle ratio (opt GU6)
4x2, semi-floating, 6 lug wheel, 3.73 ratio (opt GT4)
4x2, semi-floating, 6 lug wheel, 4.10 ratio (opt GT5)
4x2, semi-floating, 6 lug wheel, 4.56 ratio (opt HC4)
4x2, semi-floating, 8 lug wheel, 3.42 axle ratio (opt GU6)
4x2, semi-floating, 8 lug wheel, 3.73 ratio (opt GT4)
4x2, semi-floating, 8 lug wheel, 4.10 ratio (opt GT5)
4x2, semi-floating, 8 lug wheel, 4.56 ratio (opt HC4)
4x4, full-floating, 3.42 axle ratio (opt GU6)
4x4, full-floating, 3.73 ratio (opt GT4)
4x4, full-floating, 4.10 ratio (opt GT5)
4x4, full-floating, 4.56 ratio (opt HC4)
4x4, semi-floating, 6 lug wheel, 3.42 axle ratio (opt GU6)
4x4, semi-floating, 6 lug wheel, 3.73 ratio (opt GT4)
4x4, semi-floating, 6 lug wheel, 4.10 ratio (opt GT5)
4x4, semi-floating, 8 lug wheel, 3.42 axle ratio (opt GU6)
4x4, semi-floating, 8 lug wheel, 3.73 ratio (opt GT4)
4x4, semi-floating, 8 lug wheel, 4.10 ratio (opt GT5)
4x4, semi-floating, 8 lug wheel, 4.56 ratio (opt HC4)

1993 gmc 2500 pickup Rear Axles

4x2, full-floating, 3.42 axle ratio (opt GU6)
4x2, full-floating, 3.73 ratio (opt GT4)
4x2, full-floating, 4.10 ratio (opt GT5)
4x2, full-floating, 4.56 ratio (opt HC4)
4x2, semi-floating, 6 lug wheel, 3.42 axle ratio (opt GU6)
4x2, semi-floating, 6 lug wheel, 3.73 ratio (opt GT4)
4x2, semi-floating, 6 lug wheel, 4.10 ratio (opt GT5)
4x2, semi-floating, 6 lug wheel, 4.56 ratio (opt HC4)
4x2, semi-floating, 8 lug wheel, 3.42 axle ratio (opt GU6)
4x2, semi-floating, 8 lug wheel, 3.73 ratio (opt GT4)
4x2, semi-floating, 8 lug wheel, 4.10 ratio (opt GT5)
4x2, semi-floating, 8 lug wheel, 4.56 ratio (opt HC4)
4x4, full-floating, 3.42 axle ratio (opt GU6)
4x4, full-floating, 3.73 ratio (opt GT4)
4x4, full-floating, 4.10 ratio (opt GT5)
4x4, full-floating, 4.56 ratio (opt HC4)
4x4, semi-floating, 6 lug wheel, 3.42 axle ratio (opt GU6)
4x4, semi-floating, 6 lug wheel, 3.73 ratio (opt GT4)
4x4, semi-floating, 6 lug wheel, 4.10 ratio (opt GT5)
4x4, semi-floating, 8 lug wheel, 3.42 axle ratio (opt GU6)
4x4, semi-floating, 8 lug wheel, 3.73 ratio (opt GT4)
4x4, semi-floating, 8 lug wheel, 4.10 ratio (opt GT5)
4x4, semi-floating, 8 lug wheel, 4.56 ratio (opt HC4)

1992 gmc 2500 pickup Rear Axles

4x2, full-floating, 3.42 axle ratio (opt GU6)
4x2, full-floating, 3.73 ratio (opt GT4)
4x2, full-floating, 4.10 ratio (opt GT5)
4x2, full-floating, 4.56 ratio (opt HC4)
4x2, semi-floating, 6 lug wheel, 3.42 axle ratio (opt GU6)
4x2, semi-floating, 6 lug wheel, 3.73 ratio (opt GT4)
4x2, semi-floating, 6 lug wheel, 4.10 ratio (opt GT5)
4x2, semi-floating, 6 lug wheel, 4.56 ratio (opt HC4)
4x2, semi-floating, 8 lug wheel, 3.42 axle ratio (opt GU6)
4x2, semi-floating, 8 lug wheel, 3.73 ratio (opt GT4)
4x2, semi-floating, 8 lug wheel, 4.10 ratio (opt GT5)
4x2, semi-floating, 8 lug wheel, 4.56 ratio (opt HC4)
4x4, full-floating, 3.42 axle ratio (opt GU6)
4x4, full-floating, 3.73 ratio (opt GT4)
4x4, full-floating, 4.10 ratio (opt GT5)
4x4, full-floating, 4.56 ratio (opt HC4)
4x4, semi-floating, 6 lug wheel, 3.42 axle ratio (opt GU6)
4x4, semi-floating, 6 lug wheel, 3.73 ratio (opt GT4)
4x4, semi-floating, 6 lug wheel, 4.10 ratio (opt GT5)
4x4, semi-floating, 8 lug wheel, 3.42 axle ratio (opt GU6)
4x4, semi-floating, 8 lug wheel, 3.73 ratio (opt GT4)
4x4, semi-floating, 8 lug wheel, 4.10 ratio (opt GT5)
4x4, semi-floating, 8 lug wheel, 4.56 ratio (opt HC4)

1991 gmc 2500 pickup Rear Axles

4x2, full-floating, 3.42 axle ratio (opt GU6)
4x2, full-floating, 3.73 ratio (opt GT4)
4x2, full-floating, 4.10 ratio (opt GT5)
4x2, full-floating, 4.56 ratio (opt HC4)
4x2, semi-floating, 6 lug wheel, 3.42 axle ratio (opt GU6)
4x2, semi-floating, 6 lug wheel, 3.73 ratio (opt GT4)
4x2, semi-floating, 6 lug wheel, 4.10 ratio (opt GT5)
4x2, semi-floating, 6 lug wheel, 4.56 ratio (opt HC4)
4x2, semi-floating, 8 lug wheel, auxiliary spring, 3.42 axle ratio (opt GU6)
4x2, semi-floating, 8 lug wheel, auxiliary spring, 3.73 ratio (opt GT4)
4x2, semi-floating, 8 lug wheel, auxiliary spring, 4.10 ratio (opt GT5)
4x2, semi-floating, 8 lug wheel, auxiliary spring, 4.56 ratio (opt HC4)
4x2, semi-floating, 8 lug wheel, w/o auxiliary spring, 3.42 axle ratio (opt GU6)
4x2, semi-floating, 8 lug wheel, w/o auxiliary spring, 3.73 ratio (opt GT4)
4x2, semi-floating, 8 lug wheel, w/o auxiliary spring, 4.10 ratio (opt GT5)
4x2, semi-floating, 8 lug wheel, w/o auxiliary spring, 4.56 ratio (opt HC4)
4x4, full-floating, 3.42 axle ratio (opt GU6)
4x4, full-floating, 3.73 ratio (opt GT4)
4x4, full-floating, 4.10 ratio (opt GT5)
4x4, full-floating, 4.56 ratio (opt HC4)
4x4, semi-floating, 6 lug wheel, 3.42 axle ratio (opt GU6)
4x4, semi-floating, 6 lug wheel, 3.73 ratio (opt GT4)
4x4, semi-floating, 6 lug wheel, 4.10 ratio (opt GT5)
4x4, semi-floating, 8 lug wheel, 3.42 axle ratio (opt GU6)
4x4, semi-floating, 8 lug wheel, 3.73 ratio (opt GT4)
4x4, semi-floating, 8 lug wheel, 4.10 ratio (opt GT5)
4x4, semi-floating, 8 lug wheel, 4.56 ratio (opt HC4)

1990 gmc 2500 pickup Rear Axles

4x2, full-floating, 3.42 axle ratio (opt GU6)
4x2, full-floating, 3.73 ratio (opt GT4)
4x2, full-floating, 4.10 ratio (opt GT5)
4x2, full-floating, 4.56 ratio (opt HC4)
4x2, semi-floating, 6 lug wheel, 3.42 axle ratio (opt GU6)
4x2, semi-floating, 6 lug wheel, 3.73 ratio (opt GT4)
4x2, semi-floating, 6 lug wheel, 4.10 ratio (opt GT5)
4x2, semi-floating, 6 lug wheel, 4.56 ratio (opt HC4)
4x2, semi-floating, 8 lug wheel, auxiliary spring, 3.42 axle ratio (opt GU6)
4x2, semi-floating, 8 lug wheel, auxiliary spring, 3.73 ratio (opt GT4)
4x2, semi-floating, 8 lug wheel, auxiliary spring, 4.10 ratio (opt GT5)
4x2, semi-floating, 8 lug wheel, auxiliary spring, 4.56 ratio (opt HC4)
4x2, semi-floating, 8 lug wheel, w/o auxiliary spring, 3.42 axle ratio (opt GU6)
4x2, semi-floating, 8 lug wheel, w/o auxiliary spring, 3.73 ratio (opt GT4)
4x2, semi-floating, 8 lug wheel, w/o auxiliary spring, 4.10 ratio (opt GT5)
4x2, semi-floating, 8 lug wheel, w/o auxiliary spring, 4.56 ratio (opt HC4)
4x4, full-floating, 3.42 axle ratio (opt GU6)
4x4, full-floating, 3.73 ratio (opt GT4)
4x4, full-floating, 4.10 ratio (opt GT5)
4x4, full-floating, 4.56 ratio (opt HC4)
4x4, semi-floating, 6 lug wheel, 3.42 axle ratio (opt GU6)
4x4, semi-floating, 6 lug wheel, 3.73 ratio (opt GT4)
4x4, semi-floating, 6 lug wheel, 4.10 ratio (opt GT5)
4x4, semi-floating, 8 lug wheel, 3.42 axle ratio (opt GU6)
4x4, semi-floating, 8 lug wheel, 3.73 ratio (opt GT4)
4x4, semi-floating, 8 lug wheel, 4.10 ratio (opt GT5)
4x4, semi-floating, 8 lug wheel, 4.56 ratio (opt HC4)

1989 gmc 2500 pickup Rear Axles

4x2, model VIN C (5th digit), 6 lug wheel, 3.42 axle ratio (opt GU6)
4x2, model VIN C (5th digit), 6 lug wheel, 3.73 ratio (opt GT4)
4x2, model VIN C (5th digit), 6 lug wheel, 4.10 ratio (opt GT5)
4x2, model VIN C (5th digit), 6 lug wheel, 4.56 ratio (opt HC4)
4x2, model VIN C (5th digit), 8 lug wheel, 3.42 axle ratio (opt GU6)
4x2, model VIN C (5th digit), 8 lug wheel, 3.73 ratio (opt GT4)
4x2, model VIN C (5th digit), 8 lug wheel, 4.10 ratio (opt GT5)
4x2, model VIN C (5th digit), 8 lug wheel, 4.56 ratio (opt HC4)
4x2, model VIN R (5th digit), 3.42 axle ratio (opt GU6)
4x2, model VIN R (5th digit), 3.73 ratio (opt GT4)
4x2, model VIN R (5th digit), 4.10 ratio (opt GT5)
4x2, model VIN R (5th digit), 4.56 ratio (opt HC4)
4x4, 6 lug wheel, 3.42 axle ratio (opt GU6)
4x4, 6 lug wheel, 3.73 ratio (opt GT4)
4x4, 6 lug wheel, 4.10 ratio (opt GT5)
4x4, 8 lug wheel, 3.42 axle ratio (opt GU6)
4x4, 8 lug wheel, 3.73 ratio (opt GT4)
4x4, 8 lug wheel, 4.10 ratio (opt GT5)
4x4, 8 lug wheel, 4.56 ratio (opt HC4)

1988 gmc 2500 pickup Rear Axles

4x2, model VIN C (5th digit), 3.42 axle ratio (opt GU6)
4x2, model VIN C (5th digit), 3.73 ratio (opt GT4)
4x2, model VIN C (5th digit), 4.10 ratio (opt GT5)
4x2, model VIN C (5th digit), 4.56 ratio (opt HC4)
4x2, model VIN R (5th digit), 3.42 axle ratio (opt GU6)
4x2, model VIN R (5th digit), 3.73 ratio (opt GT4)
4x2, model VIN R (5th digit), 4.10 ratio (opt GT5)
4x2, model VIN R (5th digit), 4.56 ratio (opt HC4)
4x4, (model VIN K, 5th digit), 3.42 axle ratio (opt GU6)
4x4, (model VIN K, 5th digit), 3.73 ratio (opt GT4)
4x4, (model VIN K, 5th digit), 4.10 ratio (opt GT5)

1987 gmc 2500 pickup Rear Axles

4x2, Crew Cab, 3.23 ratio (opt GU5)
4x2, Crew Cab, 3.42 axle ratio (opt GU6)
4x2, Crew Cab, 3.73 ratio (opt GT4)
4x2, Crew Cab, 4.10 ratio (opt GT5)
4x2, Crew Cab, 4.56 ratio (opt HC4)
4x2, exc. Crew Cab, full-floating, 3.21 ratio (opt HC8)
4x2, exc. Crew Cab, full-floating, 3.42 axle ratio (opt GU6)
4x2, exc. Crew Cab, full-floating, 3.73 ratio (opt GT4)
4x2, exc. Crew Cab, full-floating, 4.10 ratio (opt GT5)
4x2, exc. Crew Cab, full-floating, 4.56 ratio (opt HC4)
4x2, exc. Crew Cab, semi-floating, 3.23 ratio (opt GU5)
4x2, exc. Crew Cab, semi-floating, 3.42 axle ratio (opt GU6)
4x2, exc. Crew Cab, semi-floating, 3.73 ratio (opt GT4)
4x2, exc. Crew Cab, semi-floating, 4.10 ratio (opt GT5)
4x2, exc. Crew Cab, semi-floating, 4.56 ratio (opt HC4)
4x4, 3.23 ratio (opt GU5)
4x4, 3.42 axle ratio (opt GU6)
4x4, 3.73 ratio (opt GT4)
4x4, 4.10 ratio (opt GT5)

1986 gmc 2500 pickup Rear Axles

4x2, Crew Cab, 3.23 ratio (opt GU5)
4x2, Crew Cab, 3.42 axle ratio (opt GU6)
4x2, Crew Cab, 3.73 ratio (opt GT4)
4x2, Crew Cab, 4.10 ratio (opt GT5)
4x2, Crew Cab, 4.56 ratio (opt HC4)
4x2, exc. Crew Cab, full-floating, 3.21 ratio (opt HC8)
4x2, exc. Crew Cab, full-floating, 3.42 axle ratio (opt GU6)
4x2, exc. Crew Cab, full-floating, 3.73 ratio (opt GT4)
4x2, exc. Crew Cab, full-floating, 4.10 ratio (opt GT5)
4x2, exc. Crew Cab, full-floating, 4.56 ratio (opt HC4)
4x2, exc. Crew Cab, semi-floating, 3.23 ratio (opt GU5)
4x2, exc. Crew Cab, semi-floating, 3.42 axle ratio (opt GU6)
4x2, exc. Crew Cab, semi-floating, 3.73 ratio (opt GT4)
4x2, exc. Crew Cab, semi-floating, 4.10 ratio (opt GT5)
4x2, exc. Crew Cab, semi-floating, 4.56 ratio (opt HC4)
4x4, 3.23 ratio (opt GU5)
4x4, 3.42 axle ratio (opt GU6)
4x4, 3.73 ratio (opt GT4)
4x4, 4.10 ratio (opt GT5)

1985 gmc 2500 pickup Rear Axles

4x2, Crew Cab, 3.23 ratio (opt GU5)
4x2, Crew Cab, 3.42 axle ratio (opt GU6)
4x2, Crew Cab, 3.73 ratio (opt GT4)
4x2, Crew Cab, 4.10 ratio (opt GT5)
4x2, Crew Cab, 4.56 ratio (opt HC4)
4x2, exc. Crew Cab, full-floating, 3.21 ratio (opt HC8)
4x2, exc. Crew Cab, full-floating, 3.42 axle ratio (opt GU6)
4x2, exc. Crew Cab, full-floating, 3.73 ratio (opt GT4)
4x2, exc. Crew Cab, full-floating, 4.10 ratio (opt GT5)
4x2, exc. Crew Cab, full-floating, 4.56 ratio (opt HC4)
4x2, exc. Crew Cab, semi-floating, 3.23 ratio (opt GU5)
4x2, exc. Crew Cab, semi-floating, 3.42 axle ratio (opt GU6)
4x2, exc. Crew Cab, semi-floating, 3.73 ratio (opt GT4)
4x2, exc. Crew Cab, semi-floating, 4.10 ratio (opt GT5)
4x2, exc. Crew Cab, semi-floating, 4.56 ratio (opt HC4)
4x4, 3.23 ratio (opt GU5)
4x4, 3.42 axle ratio (opt GU6)
4x4, 3.73 ratio (opt GT4)
4x4, 4.10 ratio (opt GT5)

1984 gmc 2500 pickup Rear Axles

4x2, Crew Cab, 3.23 ratio (opt GU5)
4x2, Crew Cab, 3.42 axle ratio (opt GU6)
4x2, Crew Cab, 3.73 ratio (opt GT4)
4x2, Crew Cab, 4.10 ratio (opt GT5)
4x2, Crew Cab, 4.56 ratio (opt HC4)
4x2, exc. Crew Cab, full-floating, 3.21 ratio (opt HC8)
4x2, exc. Crew Cab, full-floating, 3.42 axle ratio (opt GU6)
4x2, exc. Crew Cab, full-floating, 3.73 ratio (opt GT4)
4x2, exc. Crew Cab, full-floating, 4.10 ratio (opt GT5)
4x2, exc. Crew Cab, full-floating, 4.56 ratio (opt HC4)
4x2, exc. Crew Cab, semi-floating, 3.23 ratio (opt GU5)
4x2, exc. Crew Cab, semi-floating, 3.42 axle ratio (opt GU6)
4x2, exc. Crew Cab, semi-floating, 3.73 ratio (opt GT4)
4x2, exc. Crew Cab, semi-floating, 4.10 ratio (opt GT5)
4x2, exc. Crew Cab, semi-floating, 4.56 ratio (opt HC4)
4x4, 3.23 ratio (opt GU5)
4x4, 3.42 axle ratio (opt GU6)
4x4, 3.73 ratio (opt GT4)
4x4, 4.10 ratio (opt GT5)

1983 gmc 2500 pickup Rear Axles

4x2, Crew Cab, 3.23 ratio (opt GU5)
4x2, Crew Cab, 3.42 axle ratio (opt GU6)
4x2, Crew Cab, 3.73 ratio (opt GT4)
4x2, Crew Cab, 4.10 ratio (opt GT5)
4x2, Crew Cab, 4.56 ratio (opt HC4)
4x2, exc. Crew Cab, full-floating, 3.21 ratio (opt HC8)
4x2, exc. Crew Cab, full-floating, 3.42 axle ratio (opt GU6)
4x2, exc. Crew Cab, full-floating, 3.73 ratio (opt GT4)
4x2, exc. Crew Cab, full-floating, 4.10 ratio (opt GT5)
4x2, exc. Crew Cab, full-floating, 4.56 ratio (opt HC4)
4x2, exc. Crew Cab, semi-floating, 3.23 ratio (opt GU5)
4x2, exc. Crew Cab, semi-floating, 3.42 axle ratio (opt GU6)
4x2, exc. Crew Cab, semi-floating, 3.73 ratio (opt GT4)
4x2, exc. Crew Cab, semi-floating, 4.10 ratio (opt GT5)
4x2, exc. Crew Cab, semi-floating, 4.56 ratio (opt HC4)
4x4, 3.23 ratio (opt GU5)
4x4, 3.42 axle ratio (opt GU6)
4x4, 3.73 ratio (opt GT4)
4x4, 4.10 ratio (opt GT5)

1982 gmc 2500 pickup Rear Axles

4x2, Crew Cab, 3.23 ratio (opt GU5)
4x2, Crew Cab, 3.42 axle ratio (opt GU6)
4x2, Crew Cab, 3.73 ratio (opt GT4)
4x2, Crew Cab, 4.10 ratio (opt GT5)
4x2, Crew Cab, 4.56 ratio (opt HC4)
4x2, exc. Crew Cab, full-floating, 3.21 ratio (opt HC8)
4x2, exc. Crew Cab, full-floating, 3.42 axle ratio (opt GU6)
4x2, exc. Crew Cab, full-floating, 3.73 ratio (opt GT4)
4x2, exc. Crew Cab, full-floating, 4.10 ratio (opt GT5)
4x2, exc. Crew Cab, full-floating, 4.56 ratio (opt HC4)
4x2, exc. Crew Cab, semi-floating, 3.21 ratio (opt HC8)
4x2, exc. Crew Cab, semi-floating, 3.42 axle ratio (opt GU6)
4x2, exc. Crew Cab, semi-floating, 3.73 ratio (opt GT4)
4x2, exc. Crew Cab, semi-floating, 4.10 ratio (opt GT5)
4x2, exc. Crew Cab, semi-floating, 4.56 ratio (opt HC4)
4x4, 3.23 ratio (opt GU5)
4x4, 3.42 axle ratio (opt GU6)
4x4, 3.73 ratio (opt GT4)
4x4, 4.10 ratio (opt GT5)

1981 gmc 2500 pickup Rear Axles

4x2, Crew Cab, 3.21 ratio (opt HC8)
4x2, Crew Cab, 3.23 ratio (opt GU5)
4x2, Crew Cab, 3.42 axle ratio (opt GU6)
4x2, Crew Cab, 3.73 ratio (opt GT4)
4x2, Crew Cab, 4.10 ratio (opt GT5)
4x2, Crew Cab, 4.56 ratio (opt HC4)
4x2, exc. Crew Cab, full-floating, 3.21 ratio (opt HC8)
4x2, exc. Crew Cab, full-floating, 3.42 axle ratio (opt GU6)
4x2, exc. Crew Cab, full-floating, 3.73 ratio (opt GT4)
4x2, exc. Crew Cab, full-floating, 4.10 ratio (opt GT5)
4x2, exc. Crew Cab, full-floating, 4.56 ratio (opt HC4)
4x2, exc. Crew Cab, semi-floating, 3.21 ratio (opt HC8)
4x2, exc. Crew Cab, semi-floating, 3.42 axle ratio (opt GU6)
4x2, exc. Crew Cab, semi-floating, 3.73 ratio (opt GT4)
4x2, exc. Crew Cab, semi-floating, 4.10 ratio (opt GT5)
4x2, exc. Crew Cab, semi-floating, 4.56 ratio (opt HC4)
4x4, 3.21 ratio (opt HC8)
4x4, 3.23 ratio (opt GU5)
4x4, 3.42 axle ratio (opt GU6)
4x4, 3.73 ratio (opt GT4)
4x4, 4.10 ratio (opt GT5)

1980 gmc 2500 pickup Rear Axles

4x2, Crew Cab, 3.21 ratio (opt HC8)
4x2, Crew Cab, 3.23 ratio (opt GU5)
4x2, Crew Cab, 3.42 axle ratio (opt GU6)
4x2, Crew Cab, 3.73 ratio (opt GT4)
4x2, Crew Cab, 4.10 ratio (opt GT5)
4x2, Crew Cab, 4.56 ratio (opt HC4)
4x2, exc. Crew Cab, 3.21 ratio (opt HC8)
4x2, exc. Crew Cab, 3.42 axle ratio (opt GU6)
4x2, exc. Crew Cab, 3.73 ratio (opt GT4)
4x2, exc. Crew Cab, 4.10 ratio (opt GT5)
4x2, exc. Crew Cab, 4.56 ratio (opt HC4)
4x4, 3.21 ratio (opt HC8)
4x4, 3.23 ratio (opt GU5)
4x4, 3.42 axle ratio (opt GU6)
4x4, 3.73 ratio (opt GT4)
4x4, 4.10 ratio (opt GT5)

1979 gmc 2500 pickup Rear Axles

4x2, Crew Cab, 3.21 ratio (opt HC8)
4x2, Crew Cab, 3.23 ratio (opt GU5)
4x2, Crew Cab, 3.42 axle ratio (opt GU6)
4x2, Crew Cab, 3.73 ratio (opt GT4)
4x2, Crew Cab, 4.10 ratio (opt GT5)
4x2, Crew Cab, 4.56 ratio (opt HC4)
4x2, exc. Crew Cab, 3.21 ratio (opt HC8)
4x2, exc. Crew Cab, 3.42 axle ratio (opt GU6)
4x2, exc. Crew Cab, 3.73 ratio (opt GT4)
4x2, exc. Crew Cab, 4.10 ratio (opt GT5)
4x2, exc. Crew Cab, 4.56 ratio (opt HC4)
4x4, 3.21 ratio (opt HC8)
4x4, 3.23 ratio (opt GU5)
4x4, 3.42 axle ratio (opt GU6)
4x4, 3.73 ratio (opt GT4)
4x4, 4.10 ratio (opt GT5)

1978 gmc 2500 pickup Rear Axles

4x2, Crew Cab, 3.21 ratio (opt HC8)
4x2, Crew Cab, 3.23 ratio (opt GU5)
4x2, Crew Cab, 3.42 axle ratio (opt GU6)
4x2, Crew Cab, 3.73 ratio (opt GT4)
4x2, Crew Cab, 4.10 ratio (opt GT5)
4x2, Crew Cab, 4.56 ratio (opt HC4)
4x2, exc. Crew Cab, 3.21 ratio (opt HC8)
4x2, exc. Crew Cab, 3.42 axle ratio (opt GU6)
4x2, exc. Crew Cab, 3.73 ratio (opt GT4)
4x2, exc. Crew Cab, 4.10 ratio (opt GT5)
4x2, exc. Crew Cab, 4.56 ratio (opt HC4)
4x4, 3.21 ratio (opt HC8)
4x4, 3.23 ratio (opt GU5)
4x4, 3.42 axle ratio (opt GU6)
4x4, 3.73 ratio (opt GT4)
4x4, 4.10 ratio (opt GT5)

1977 gmc 2500 pickup Rear Axles

4x2, Crew Cab, 3.21 ratio (opt HC8)
4x2, Crew Cab, 3.23 ratio (opt GU5)
4x2, Crew Cab, 3.42 axle ratio (opt GU6)
4x2, Crew Cab, 3.73 ratio (opt GT4)
4x2, Crew Cab, 4.10 ratio (opt GT5)
4x2, Crew Cab, 4.56 ratio (opt HC4)
4x2, exc. Crew Cab, 3.21 ratio (opt HC8)
4x2, exc. Crew Cab, 3.42 axle ratio (opt GU6)
4x2, exc. Crew Cab, 3.73 ratio (opt GT4)
4x2, exc. Crew Cab, 4.10 ratio (opt GT5)
4x2, exc. Crew Cab, 4.56 ratio (opt HC4)
4x4, 3.21 ratio (opt HC8)
4x4, 3.23 ratio (opt GU5)
4x4, 3.42 axle ratio (opt GU6)
4x4, 3.73 ratio (opt GT4)
4x4, 4.10 ratio (opt GT5)

1976 gmc 2500 pickup Rear Axles

4x2, Crew Cab, 3.21 ratio (opt HC8)
4x2, Crew Cab, 3.23 ratio (opt GU5)
4x2, Crew Cab, 3.42 axle ratio (opt GU6)
4x2, Crew Cab, 3.73 ratio (opt GT4)
4x2, Crew Cab, 4.10 ratio (opt GT5)
4x2, Crew Cab, 4.56 ratio (opt HC4)
4x2, exc. Crew Cab, 3.21 ratio (opt HC8)
4x2, exc. Crew Cab, 3.42 axle ratio (opt GU6)
4x2, exc. Crew Cab, 3.73 ratio (opt GT4)
4x2, exc. Crew Cab, 4.10 ratio (opt GT5)
4x2, exc. Crew Cab, 4.56 ratio (opt HC4)
4x4, 3.21 ratio (opt HC8)
4x4, 3.23 ratio (opt GU5)
4x4, 3.42 axle ratio (opt GU6)
4x4, 3.73 ratio (opt GT4)
4x4, 4.10 ratio (opt GT5)

1975 gmc 2500 pickup Rear Axles

4x2, Crew Cab, 3.21 ratio (opt HC8)
4x2, Crew Cab, 3.23 ratio (opt GU5)
4x2, Crew Cab, 3.42 axle ratio (opt GU6)
4x2, Crew Cab, 3.73 ratio (opt GT4)
4x2, Crew Cab, 4.10 ratio (opt GT5)
4x2, Crew Cab, 4.56 ratio (opt HC4)
4x2, exc. Crew Cab, 3.21 ratio (opt HC8)
4x2, exc. Crew Cab, 3.42 axle ratio (opt GU6)
4x2, exc. Crew Cab, 3.73 ratio (opt GT4)
4x2, exc. Crew Cab, 4.10 ratio (opt GT5)
4x2, exc. Crew Cab, 4.56 ratio (opt HC4)
4x4, 3.21 ratio (opt HC8)
4x4, 3.23 ratio (opt GU5)
4x4, 3.42 axle ratio (opt GU6)
4x4, 3.73 ratio (opt GT4)
4x4, 4.10 ratio (opt GT5)

1974 gmc 2500 pickup Rear Axles

4x2, Crew Cab, 3.21 ratio (opt HC8)
4x2, Crew Cab, 3.23 ratio (opt GU5)
4x2, Crew Cab, 3.42 axle ratio (opt GU6)
4x2, Crew Cab, 3.73 ratio (opt GT4)
4x2, Crew Cab, 4.10 ratio (opt GT5)
4x2, Crew Cab, 4.56 ratio (opt HC4)
4x2, exc. Crew Cab, 3.21 ratio (opt HC8)
4x2, exc. Crew Cab, 3.42 axle ratio (opt GU6)
4x2, exc. Crew Cab, 3.73 ratio (opt GT4)
4x2, exc. Crew Cab, 4.10 ratio (opt GT5)
4x2, exc. Crew Cab, 4.56 ratio (opt HC4)
4x4, 3.21 ratio (opt HC8)
4x4, 3.23 ratio (opt GU5)
4x4, 3.42 axle ratio (opt GU6)
4x4, 3.73 ratio (opt GT4)
4x4, 4.10 ratio (opt GT5)

1973 gmc 2500 pickup Rear Axles

4x2, Crew Cab, 3.21 ratio (opt HC8)
4x2, Crew Cab, 3.23 ratio (opt GU5)
4x2, Crew Cab, 3.42 axle ratio (opt GU6)
4x2, Crew Cab, 3.73 ratio (opt GT4)
4x2, Crew Cab, 4.10 ratio (opt GT5)
4x2, Crew Cab, 4.56 ratio (opt HC4)
4x2, exc. Crew Cab, 3.21 ratio (opt HC8)
4x2, exc. Crew Cab, 3.42 axle ratio (opt GU6)
4x2, exc. Crew Cab, 3.73 ratio (opt GT4)
4x2, exc. Crew Cab, 4.10 ratio (opt GT5)
4x2, exc. Crew Cab, 4.56 ratio (opt HC4)
4x4, 3.21 ratio (opt HC8)
4x4, 3.23 ratio (opt GU5)
4x4, 3.42 axle ratio (opt GU6)
4x4, 3.73 ratio (opt GT4)
4x4, 4.10 ratio (opt GT5)

1972 gmc 2500 pickup Rear Axles

4x2, non-removable carrier, coil spring
4x2, non-removable carrier, leaf springs
4x2, removable carrier
4x4, non-removable carrier
4x4, removable carrier

1971 gmc 2500 pickup Rear Axles

4x2, non-removable carrier, coil spring
4x2, non-removable carrier, leaf springs
4x2, removable carrier
4x4, non-removable carrier
4x4, removable carrier

1970 gmc 2500 pickup Rear Axles

4x2, non-removable carrier, coil spring
4x2, non-removable carrier, leaf springs
4x2, removable carrier
4x4, non-removable carrier
4x4, removable carrier

1969 gmc 2500 pickup Rear Axles

4x2, non-removable carrier, coil spring
4x2, non-removable carrier, leaf springs
4x2, removable carrier
4x4, non-removable carrier
4x4, removable carrier

1968 gmc 2500 pickup Rear Axles

4x2, non-removable carrier, coil spring
4x2, non-removable carrier, leaf springs
4x2, removable carrier
4x4, non-removable carrier
4x4, removable carrier

1967 gmc 2500 pickup Rear Axles

4x2, non-removable carrier
4x2, removable carrier
4x4, non-removable carrier
4x4, removable carrier