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  1. S

    TH400 shift timing issues

    If you had the vacuum pump hooked up directly to the transmission modulator and it still shifted soft try taking vacuum away and see if it shifts hard if it doesnt change it would most likely be either the modulator valve or govenor on the transmission if all the lines are good and you have good...
  2. S

    TH400 shift timing issues

    Just had the same problem with one of my trucks it was the govenor bad the teflon gears were still good but the springs must have been bad. Easy to change and fixed my quick shift from 1st to 3rd.
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