There are 9 choices

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

Rear Axle Assembly for 2006 Chevrolet Colorado

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

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