There are 11 choices

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SIERRA DENALI 1500
- 9.50" ring gear
  - AAM built (opt SU7)
  - GM built (opt SU8)
- 9.75" ring gear
SIERRA DENALI 2500
- 3.42 ratio (opt GU6)
- 3.73 ratio (opt GT4)
SIERRA DENALI 3500
- 6' 6" box
  - 3.42 ratio (opt GU6)
  - 3.73 ratio (opt GT4)
- 8' box
  - dual rear wheels
    - 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 2023 GMC Sierra Denali

Fits: SIERRA DENALI 3500 8' box single rear wheels 3.42 ratio opt GU6 (change)

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