There are 29 choices

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8.6" ring gear (10 bolt)
- brake opt JD9
- brake opt JF3
  - active brake control (opt JL4)
  - Without active brake control
- brake opt JF7
  - active brake control (opt JL4)
  - Without active brake control
- brake opt JG4
  - active brake control (opt JL4)
  - Without active brake control
    - 3.23 ratio (opt GU5)
    - 3.42 ratio (opt GU6)
    - 3.73 ratio (opt GT4)
    - 4.10 ratio (opt GT5)
9.5" ring gear (14 bolt)
- brake opt JD9
- brake opt JF3

Rear Axle Assembly for 2008 GMC Sierra 1500 HD

Fits: 8.6 ring gear 10 bolt brake opt JG4 Without active brake control 4.10 ratio opt GT5 (change)

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