There are 24 choices

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Automatic Transmission
- 4x4
  - TH400
    - 8 cylinder
      - diesel
      - gasoline
- model VIN C (5th digit, 4x2)
  - TH400
    - 6 cylinder
    - 8 cylinder
  - TH700
    - diesel
    - gasoline
      - auxiliary valve body
      - Without auxiliary valve body
- model VIN K (5th digit, 4x4)
  - TH400
    - 6 cylinder
    - 8 cylinder
      - diesel
      - gasoline
  - TH700
    - diesel
    - gasoline
      - auxiliary valve body
      - Without auxiliary valve body
- model VIN R (5th digit, 4x2)
  - TH400
  - TH700
    - diesel
    - gasoline
      - ECU equipped
      - Without ECU equipped
Manual Transmission
- 4 speed
  - 4x2
    - model VIN C (5th digit)
    - model VIN R (5th digit)
  - 4x4
    - (model VIN K, 5th digit)
- 5 speed
  - 4x2
  - 4x4

Transmission Assembly for 1988 GMC K2500 Pickup

Fits: Manual Transmission 4 speed 4x2 model VIN R 5th digit (change)

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