There are 12 choices

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Automatic Transmission
- Automatic Transmission-218
- TH400
  - big block
  - small block
Manual Transmission
- 3 speed
  - Muncie SM318
    - 4x2
    - 4x4
  - Saginaw SM326
    - 4x2
      - overdrive
      - Without overdrive
    - 4x4
  - Warner T16D
- 4 speed
  - Muncie SM465
    - 4x2
    - 4x4
  - New Process 435

Transmission Assembly for 1968 GMC K15/K1500 Pickup

Fits: Manual Transmission 3 speed Saginaw SM326 4x2 overdrive (change)

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