There are 12 choices

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Automatic Transmission
- Automatic Transmission-218
- TH350
  - 4x2
    - multi-fit case
    - Without multi-fit case
  - 4x4
- TH400
  - big block
  - small block
Manual Transmission
- 3 speed
  - Muncie SM330
    - 4x2
    - 4x4
  - Saginaw SM326
- 4 speed
  - Muncie SM465
    - 4x2
    - 4x4
  - New Process 435

Transmission Assembly for 1971 GMC C25/C2500 Pickup

Fits: Manual Transmission 4 speed Muncie SM465 4x4 (change)

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