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
9.5" ring gear (14 bolt)
- brake opt JD9
  - 3.42 ratio (opt GU6)
  - 3.73 ratio (opt GT4)
  - 4.10 ratio (opt GT5)
- brake opt JF3

Rear Axle Assembly for 2008 GMC Sierra 1500 HD

Fits: 9.5 ring gear 14 bolt brake opt JD9 4.10 ratio opt GT5 (change)

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