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6.0L (VIN U, 8th digit)
- CNG
- gasoline
6.6L turbo diesel
- VIN 1 (8th digit)
  - California
  - Federal
    - opt NF2
    - opt NF4
- VIN 2 (8th digit)
8.1L (VIN G, 8th digit)

Engine Assembly for 2004 GMC Sierra 2500 HD

Fits: 6.6L turbo diesel VIN 1 8th digit Federal opt NF4 (change)

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