1991 F-150, 302, E4OD. Blew the front seal recently & replaced the pump seal, torque converter & filter. Ran fine for several weeks, then quit completely. Current symptoms:

When starting cold, it will pull & shift, apparently correctly. After it warms up (3-5 minutes), it will not move in any gear position.

Fluid is full & clean. Any troubleshooting I can do before I pull it & rebuild or replace it?

Thanks,
Mike in Tennessee

 

I am having a similar problem with a AOD in a '92. When it is cold, it will move in reverse, but as it warms up it won't. I'm taking the truck into the shop next week to the local trany shop to see what's up.