Gets worse when the transaxle gets reaches operating temperature
clutches, steels, band, and converter
I teach automatic transmissions at a technical college and this car belongs to one of my students. It came in with no shifting problems but the fluid looked bad and the student wanted to go through it while he was in the class.
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Problem
After a complete rebuild, it shifts great but engages hard in drive and reverse once it reaches operating temperature. We have looked at the accumulators and replaced the valve body with a known good part and the problem hasn't changed. We also replaced the transaxle mounts. Our line pressure readings at idle are: park/neutral 60 psi, reverse 120 psi, and drive 60 psi. Thanks for your help!