There are 34 choices

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Crew Cab
- 6 lug wheel
  - 3.23 ratio (opt GU5)
  - 3.42 ratio (opt GU6)
  - 3.73 ratio (opt GT4)
    - 8.6" ring gear
    - 9.5" ring gear (opt AXN)
  - 4.10 ratio (opt GT5)
    - 8.6" ring gear
    - 9.5" ring gear (opt AXN)
- 8 lug wheel
  - 3.73 ratio (opt GT4)
  - 4.10 ratio (opt GT5)
Extended Cab
- 3.23 ratio (opt GU5)
  - disc rear brakes
  - drum rear brakes
    - opt JF3
    - opt JF7
- 3.42 ratio (opt GU6)
  - disc rear brakes
  - drum rear brakes
    - opt JF3
    - opt JF7
- 3.73 ratio (opt GT4)
  - 8.6" ring gear
    - disc rear brakes
    - drum rear brakes
      - opt JF3
      - opt JF7
  - 9.5" ring gear (opt AXN)
- 4.10 ratio (opt GT5)
  - 8.6" ring gear
    - opt JF3
    - opt JF7
  - 9.5" ring gear (opt AXN)
Regular Cab
- 3.23 ratio (opt GU5)
  - disc rear brakes
  - drum rear brakes
    - opt JF3
    - opt JF7
- 3.42 ratio (opt GU6)
  - disc rear brakes
  - drum rear brakes
    - opt JF3
    - opt JF7
- 3.73 ratio (opt GT4)
  - 8.6" ring gear
    - disc rear brakes
    - drum rear brakes
      - opt JF3
      - opt JF7
  - 9.5" ring gear (opt AXN)
- 4.10 ratio (opt GT5)
  - 8.6" ring gear
    - opt JF3
    - opt JF7
  - 9.5" ring gear (opt AXN)

Rear Axle Assembly for 2006 GMC Sierra 1500 HD

Fits: Regular Cab 3.73 ratio opt GT4 8.6 ring gear disc rear brakes (change)

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