rpms up speed goes down on acceleration on 1999 Ford F-150

4r70w transmission, fluid good, filter changed. Rpm's go up when engaging passing gear, and speed falls off. I have to let off pedal until rpms fall to 1500, then start again slowly. I've had this problem for 6 months. truck drives fine unless trying to pass. No codes on scan.

by in Delight, AR on June 12, 2010
0 answers