I have a 84 4+3 and I am having some serious problems. I just had the OD rebuilt. I got it back and it worked fine for a week or so. Then all of a sudden I could not get the thing in reverse. I took it back to the shop and they claim now its the shifter. I just cannot believe that. Has anyone ever heard of this happening before. When I took the car in the only reason I had the thing rebuilt is due to a leak of the gear oil from the front half. Oh yea!! If I get under it I can put it in reverse with no problem. If anyone can help please reply.