There are 11 choices

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SUBURBAN 1500
- 4x2
  - 8-1/2" ring gear (10 bolt)
  - 9-1/2" ring gear (opt AXN, 14 bolt)
    - 3.42 axle ratio (opt GU6)
    - 4.10 ratio (opt GT5)
- 4x4
  - 8-1/2" ring gear (10 bolt)
    - 3.73 ratio (opt GT4)
    - 4.10 ratio (opt GT5)
  - 9-1/2" ring gear (14 bolt)
    - (4.10 ratio, opt GT5)
SUBURBAN 2500
- 4x2
  - (3.73 ratio, opt GT4)
- 4x4
  - (3.73 ratio, opt GT4)

Rear Axle Assembly for 2008 GMC Suburban

Fits: SUBURBAN 2500 4x4 3.73 ratio, opt GT4 (change)

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