There are 8 choices

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Quadrasteer (opt NYS)
- 3.73 ratio (opt GT4)
- 4.10 ratio (opt GT5)
Without Quadrasteer
- full-floating axle
  - 10.5" ring gear
    - 3.73 ratio (opt GT4)
    - 4.10 ratio (opt GT5)
  - 11.5" ring gear
    - 3.73 ratio (opt GT4)
    - 4.10 ratio (opt GT5)
- semi-floating axle
  - 3.73 ratio (opt GT4)
  - 4.10 ratio (opt GT5)

Rear Axle Assembly for 2004 GMC Sierra 2500 HD

Fits: Quadrasteer opt NYS 3.73 ratio opt GT4 (change)

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