I have a '97 Mustang GT with an automatic tranny. Recently, the transmission will not go into overdrive. When it shifts to OD it slips like it is in neutral. I have replaced OD servo, OD boost valve, pressure regulator valve and pressure solenoid, OD band, and 2-3 accumulator and it still slips. Any help would be greatly appreciated. Thanks.

 

I know this is not what you want to hear, but why don't you just take it to a good tranny place that
can properly diagnose and fix it. Seems like you have invested a lot of your time and money and are no closer to getting it fixed. Thats what I would do.

 

Thats a waste of money!!! I have spent less than $200 in parts and tranny fluid doing it myself. It is not that difficult to drop a tranny and disassemble it. There has to be somebody on here who knows transmissions.