There are 18 choices

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4x2
- 7-5/8" ring gear
  - sport chassis package (opt ZQ8)
    - 3.08 ratio (opt GU4)
    - 3.42 axle ratio (opt GU6)
    - 3.73 ratio (opt GT4)
    - 4.10 ratio (opt GT5)
  - Without sport chassis package
    - 3rd shock
    - Without 3rd shock
- 8-1/2" ring gear (3.08 ratio, opt GU4)
4x4
- 7-5/8" ring gear
- 8-1/2" ring gear
  - ZR2 (3.73 ratio)
  - Without ZR2
    - (3.42 ratio, opt GU6)

Rear Axle Assembly for 2001 GMC Sonoma

Fits: 4x2 7-5/8 ring gear sport chassis package opt ZQ8 3.42 axle ratio opt GU6 (change)

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