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what will happen if the transmission fluid is overfilled by a quart or more? on 1998 Ford Mustang

Will this cause the forward gears to not work but reverse does. will draining the excess out make it work right? Trans re.cently rebuilt

Asked by for the 1998 Ford Mustang
Fluid level should not be over filled as over a period of time it could cause fluid leaks at pump seals. If you are having problems with no forward gears 1 qt of fluid would not cause that issue. May want to check with supplier of transmission and get advise from them on your problems...check to see if in warranty.
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1 more answer
most likely it will blow out your overflow and cause fluid leaks