There are 12 choices

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Automatic Transmission
- 6.0L
  - 4x2
  - 4x4
- 6.6L
  - 4x2
    - chassis cab
    - Excluding chassis cab
  - 4x4
    - chassis cab
    - Excluding chassis cab
- 8.1L
  - 4x2
  - 4x4
Manual Transmission
- 4x2
  - 5 speed (opt MW3)
  - 6 speed (opt ML6)
- 4x4
  - 5 speed (opt MW3)
  - 6 speed (opt ML6)

Transmission Assembly for 2006 GMC Sierra 3500 HD

Fits: Automatic Transmission 6.6L 4x4 Excluding chassis cab (change)

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