There are 18 choices

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Automatic Transmission
- 4x2
  - TH400
    - 6 cylinder
    - 8 cylinder
  - TH700
    - diesel
    - gasoline
      - auxiliary valve body
      - Without auxiliary valve body
- 4x4
  - TH400
    - 6 cylinder
    - 8 cylinder
      - diesel
      - gasoline
  - TH700
    - diesel
    - gasoline
      - auxiliary valve body
      - Without auxiliary valve body
Manual Transmission
- 4 speed
  - integral clutch housing
  - separate clutch housing
    - 4x2
    - 4x4
- 5 speed
  - 4x2
  - 4x4

Transmission Assembly for 1988 GMC K1500 Pickup

Fits: Automatic Transmission 4x2 TH700 gasoline auxiliary valve body (change)

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