D14 transmission problem

My D14 was jumping out of 3rd gear , so I tore it down and put a new third gear in it ( with the new third gear I needed to replace reverse also ,because the new gears were different in size from the original gears) After putting it back together and driving it the it worked fine,but I could hear something was rubbing .Till I got it back to the shop it would not shift out of gear. What could be the problem with the transmission? I removed the side panel with the forks on it. The two splined parts of the transmission where the forks hook into are not aligning up with each other . I can get them to line up with each other, but I can tell that the tractor is still locked in gear, even when they are in the neutral position. Thanks in advance for any advice .

I bet that all of us D14 owners are watching this thread! Hopefully you'll get some sound advice here - sure is the best bet for that, methinks.

Back in 2006 my D14 was was so bad I couldn't even use third gear. I was telling the local AC mechanic that used have the AC dealership here about it. He told me about moving the detent grooves so it would gear in deeper. I did it and I was able to move the groove .090 of an inch. It hasn't jumped since and I still use it quite a bit. I have done several that way for people since with good results. If mine starts doing it again I can't complain. If AC had made them go in gear deeper when they made them people wouldn't have had so much trouble with them over the years. If I was rebuilding the trans in one for myself I would move that groove just to make it last longer.