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dual rear wheels
- Chassis Cab (without box)
  - Without wide track
    - 3.42 ratio (opt GU6)
    - 3.73 ratio (opt GT4)
  - wide track (opt GTY)
    - 3.42 ratio (opt GU6)
    - 3.73 ratio (opt GT4)
- Pickup (with box)
  - 3.42 ratio (opt GU6)
  - 3.73 ratio (opt GT4)
single rear wheels
- 3.42 ratio (opt GU6)
- 3.73 ratio (opt GT4)

Rear Axle Assembly for 2021 Chevrolet Silverado 3500 HD

Fits: dual rear wheels Chassis Cab without box Without wide track 3.73 ratio opt GT4 (change)

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