Here's my story - bought a 1990 Full Size Bronco a year ago for my son. Just finished putting a new AOD in it and on the test run all was fine until I hit higher speed and it acted like it didn't want to get into 3 or 4th gear, then nothing at all and the engine would rev. NOt knowing why I guess out of desperation I had the idea of locking the front hubs and trying 4WD. It worked by now it won't get out of 4 Low or 4WD. All fluid levels are accurate and I've looked and the TV linkage is still connected. I have search similar threads but I have not found anything quite like this. Thanks in advance!