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Thread: 4L80 trans fluid complet change

  1. #1
    Join Date
    Jun 2007

    Default 4L80 trans fluid complet change

    02 6.5td 287k mls. This will be my 3rd chg. 1st 2, only dropped pan and changed filter. I wanted to do a complete fluid change. Any suggestions would be appreciated.

  2. #2
    Join Date
    Feb 2007
    Baja California Sur Mexico


    After the fluid change, refill and disconnect the cooler line, can't remember if top or bottom, so that the fluid will pass through the radiator and extra cooler. Connect a hose into a clear quart bottle. Run the engine to fill the bottle. Add another quart to the trans. Do this about 5 times until the fluid looks clean. That is how I removed the contaminated fluid from the torque converter and coolers after rebuilding the transmission.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban "F" VIN #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, Positrac 3.73 diff, 17 mpg highway.
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, 21 years.

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