There are 6 choices

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SIERRA 3500 PICKUP
- 10 speed transmission
  - opt NQF
  - opt NQH
- 6 speed transmission
  - opt NQF
  - opt NQH
SIERRA DENALI 3500
- 10 speed transmission
- 6 speed transmission

Transfer Case for 2021 GMC Sierra 3500

Fits: SIERRA 3500 PICKUP 6 speed transmission opt NQH (change)

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