There are 6 choices

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SIERRA DENALI 1500
- 10 speed transmission (opt MQB)
- 8 speed transmission (opt MQE)
SIERRA DENALI 2500
- 10 speed transmission
- 6 speed transmission
SIERRA DENALI 3500
- 10 speed transmission
- 6 speed transmission

Transfer Case for 2021 GMC Sierra Denali

Fits: SIERRA DENALI 2500 6 speed transmission (change)

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