There are 9 choices

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Automatic Transmission
- 4x2
  - TH350
  - TH400
    - diesel
    - gasoline
- 4x4 (TH350)
Manual Transmission
- 3 speed
  - 4x2
    - side cover (Saginaw manufactured)
    - top cover (Tremec manufactured)
  - 4x4
- 4 speed
  - 4x2
  - 4x4

Transmission Assembly for 1979 GMC P1500

Fits: Automatic Transmission 4x2 TH400 gasoline (change)

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