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Crew Cab
- 3.73 ratio (opt GT4)
- 4.10 ratio (opt GT5)
Excluding Crew Cab
- 4x2
  - 3.08 ratio (opt GU4)
  - 3.42 ratio (opt GU6)
  - 3.73 ratio (opt GT4)
- 4x4
  - 3.73 ratio (opt GT4)
  - 4.10 ratio (opt GT5)

Rear Axle Assembly for 2001 GMC Sierra 1500

Fits: Excluding Crew Cab 4x2 3.08 ratio opt GU4 (change)

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