I posted this same thread some time ago. Many people read it but no suggestions were given. Hopefully someone will answer me.

I have a 93 Mustang with the 2.3L 4-Cylinder and an A4LD trans. 78,000 miles. When I bought the car it has been sitting in a garage for 8 years without starting. Had it transported from MI to FL. After cleaning up the gas and doing other various repairs I started it up only to find it was leaking trans fluid badly out of the front seal. Pulled the trans off (not an easy job on a 31 year old car with no lift ). The fluid was very clean and the filter was clean but still changed them. Put in new front and rear trans seals. Now the trans doesn't leak at all and shifts fine in all gears but it will not go into 4th (overdrive). At 65 MPH I am doing 3500 RPM because it is still in 3rd. I rechecked the electrical connections (2 of them) on the trans and they are fine. What checks do I need to do to find out what is causing it not to shift into 4th? I "assume" that the car shifted fine in the past. Bought it from family and they would have told me if it wasn't right (I assume again)

 

There are two solenoids which control the lock up. I don't remember the numbers, but I believe the lockup one is referred to as the TCC. A second one disengages it. I suspect either the solenoid is stuck or the valve it controls is stuck. In any case, this is a valve body issue. I wouldn't suggest any owner try and fix it on their own, unless they're a qualified transmission mechanic.

 

Thanks for your input. I was thinking that there should be some way for me to check the solenoids. Haven't had to take a car to a shop for 53 years and I would like to keep that record. But, never had a problem with an automatic transmission either!