I have a 1992 Ford f350, truck doesn't want to shift into overdrive, I got the transmission rebuilt and put in a new torque converter also, but its still doing the same thing. Anyone has an I idea what else it could be, I'm out of ideas.

 

What does the shift selector show? Does it show OFF or anything?

 

When I turn the truck on the o/d button light turns on a d I have to push it to turn it off

 

What I believe you are doing is turning the Overdrive function OFF. Push the button again and leave it on this time and drive the vehicle. You should now have Overdrive working..

 

Thanks for the reply back. I did what you said but still does the same thing weather it's on or off.

 

If,,,,,,,,the trans goes into neutral when it should go into Overdrive,
There is a good possibility a lock ring has broken that holds the overdrive servo in place .
If that is the case, the trans pan has to come down and the valve body removed because pieces of the broken ring get jammed in one of the spool valves.
Not a difficult job, but also not for anyone without the facilities to do the job. You might consider a second opinion from a local trans shop or someone with Ford trans experience.

If the trans was just rebuilt , I would have the shop check it out