There are 14 choices

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Automatic Transmission
- 6.0L
  - 4x2
  - 4x4
- 6.6L
  - 4x2
  - 4x4
- 8.1L
  - 4x2
  - 4x4
Manual Transmission
- 2500 HD
  - 6.0L
    - 4x2
    - 4x4
  - 6.6L
    - 4x2
    - 4x4
  - 8.1L
    - 4x2
    - 4x4
- Excluding 2500 HD
  - (6.0L)
    - 4x2
    - 4x4

Transmission Assembly for 2004 GMC Sierra 2500 HD

Fits: Manual Transmission 2500 HD 6.6L 4x4 (change)

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