In my 74 fj40 I have upgraded to a h42 out of a fj60 and I just swapped the top plate and everything went together perfectly. The trans has unknown miles but there is no noises nor did I see any ware on the gear teeth. I also resealed everything, and it still leaks but whatever lol
The issue is when I'm down shifting it hangs in neutral and you can't get it in any gear unless you nearly stop. Sometimes it downshifts fine and others there is a noticeable stiffness going into 3rd or 2nd. This did improve when I topped up the oil.
I did have a very similar problem with the original transmission which leads me to believe that there may be something wrong with my top plate and not the synchros
The issue is when I'm down shifting it hangs in neutral and you can't get it in any gear unless you nearly stop. Sometimes it downshifts fine and others there is a noticeable stiffness going into 3rd or 2nd. This did improve when I topped up the oil.
I did have a very similar problem with the original transmission which leads me to believe that there may be something wrong with my top plate and not the synchros