There are 4 choices

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Automatic Transmission
- 4L80E (opt Manual Transmission1)
  - 4.3L
  - 5.7L
    - 125" wheelbase
    - 146" wheelbase
- TH700 (opt MD8)

Transmission Assembly for 1991 GMC G1500

Fits: Automatic Transmission 4L80E opt Manual Transmission1 5.7L 125 wheelbase (change)

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