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won't shift

  1. T-400 won’t shift

    Transmission - Rearend
    I have a TH400 in a 34 Coupe. I ran it hard in 1st gear until the governor shifted to 2nd. Now it won’t shift out of 1st and when you let off the gas the tranny doesn’t hold the car back it goes into a coast. There is no fluid in the vacuum line at the modulator, vacuum line is good. Level is good.