There are 8 choices

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4x2
- 3.42 axle ratio (opt GU6)
  - increased capacity chassis package (opt Z85)
  - sport chassis package (opt ZQ8)
- 3.73 ratio (opt GT4)
  - increased capacity chassis package (opt Z85)
  - off road chassis package (opt Z71)
    - 3.7L
    - 5.3L
4x4

Rear Axle Assembly for 2012 Chevrolet Colorado

Fits: 4x2 3.42 axle ratio opt GU6 sport chassis package opt ZQ8 (change)

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