This is my 2nd tranny (700r4) in the car and I really hope this one doesnt die either. Anyways this problem only happens when i leave it in OD or D, never happens when I leave it in 2nd. I'll start off normally but once i pick up speed, like say around 45mph, it slips out of gear and pretends like its in neutral. I noticed while trying to drive on the highway, it will slip out of gear and i can only really maintain 50-55mph without going over 5000rpm (and at that speed its already up in the 4000's ). For now its okay for city driving, I just leave it in 2nd at the sacrifice for some gas mileage. I checked the ATF and its still pretty full. I think I might have lost 3rd and OD... . I hope thats not the case. Any ideas on what the problem can be? I really need help here

 

3-4's are toast. Common problem.

 

yeah i had troubles going in 3 to 4 also, i guess the clutches were leaving me, after that the tranny starting sticking into gears. So i had to drive the car nice and easy overdrive. The car got wrecked before i had a change to rebuild, o well someone elses problem.