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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 2003 GMC Sierra 2500 HD

Fits: semi-floating axle 3.73 ratio opt GT4 (change)

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