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SIERRA 2500 PICKUP
- 3.42 ratio (opt GU6)
- 3.73 ratio (opt GT4)
SIERRA DENALI 2500
- 3.42 ratio (opt GU6)
- 3.73 ratio (opt GT4)

Rear Axle Assembly for 2021 GMC Sierra 2500 HD

Fits: SIERRA DENALI 2500 3.73 ratio opt GT4 (change)

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