Transmission Trouble

WKLYTTON

MEMBER
FORD F-250

Hi, I have a '01 Ford F-250 diesel 96000 miles. It is an automatic transmission. At approximately 75000 miles, the front seal leaked and was replaced. When I got my truck back, it shifted really hard, it would almost redline before it would shift into gear. Also, the overdrive light would flash on and off. I took it back to the same shop and he said I needed to replace the whole transmission. I wanted a second opinion and took it elsewhere. Turns out, the first mechanic forgot to plug in a wire that tells my transmission how fast the truck was going so it didn't know to shift. Transmission shifts great now. The overdrive light doesn't flash until I get up to 75 or 80 mph. Also, since this whole fiasco, my truck gets way worse gas mileage! Any suggestions? I have replaced the fuel filter also. Thank you for your time.

3 Replies

BRUCE HUNT

MECHANIC
3,753 POSTS

That is the 7.3 Liter right? And you do not have it chipped do you? I am wondering and I hope that someone else will chime in, but isn't it possible that the computer needs to be reset for the shift points. That can have an impact on the performance of the fuel economy.