Help Diagnosing 4R70W Noise
I have a 2001 Mustang GT with a 4R70W automatic. I purchased the car used with about 15K miles on it. I have since put another 40K miles on it. I am not sure how well the previous owner took car of it but, I have babied it the 3 years I have had it.
I have noticed a sound for some time that sounds sort of like a dragging brake. It is a faint but, audible metal rubbing sound. I recently tracked it down though to the transmission. I had the car up on ramps in the garage and the sound is very noticible through the driveshaft and with a stethascope you can hear it in the tranny. You can also hear it inside the car at certain times while driving.
I have not noticed any problems with the performance of the tranny. It shifts when it should and shifts smoothly and quickly. This is part of what is so puzzling.
The car is pretty much stock. I had the transmission flushed by the dealer at about 30K and have done a partial change including a filter change since. I have always used Motorcraft Mercon V in it. It doesn't see any track time and is my daily driver. Again I don't know how it was treated by the previous owner though.