There are 10 choices

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

Transmission Assembly for 1977 GMC K15/K1500 Pickup

Fits: Manual Transmission 3 speed 4x2 side cover Saginaw manufactured (change)

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