There are 16 choices

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Crew Cab
- Quadrasteer (opt NYS)
  - 3.73 ratio (opt GT4)
  - 4.10 ratio (opt GT5)
- Without Quadrasteer
  - 3.73 ratio (opt GT4)
  - 4.10 ratio (opt GT5)
Extended Cab
- Quadrasteer (opt NYS)
  - 3.73 ratio (opt GT4)
  - 4.10 ratio (opt GT5)
- Without Quadrasteer
  - 4x2
  - 4x4
    - 3.73 ratio (opt GT4)
    - 4.10 ratio (opt GT5)
Regular 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 2003 GMC Sierra 1500

Fits: Regular Cab 4x2 3.73 ratio opt GT4 (change)

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