Ok, little backround. Bought a YS1 used, bearings were shot and synchros were low. Bought a full rebuild kit from synchrotech and picked up an LSD because I had the funds and they’re fun. Anyways, ripped everything apart and swapped all the bearings and synchros and installed the LSD. Everything went quite smooth, no biggie… Spent the day today dropped the old tranny and installed the new one - again no issues. Moment of truth arrives, go to put it in reverse and i go forward. Yes, I hear the click of the reverse gear sliding into place but it still went forward. So I’m completely baffled. Put the shifter where 1st is, it’s neutral nothing happens. Put the shifter into neutral (able to feel neutral gate left and right) and there’s gears slightly clashing. Put it into 2nd, feels like 1st, 3rd doesn’t exist, 5th feels like 5th. And after trying all that when I try to go back into reverse it’s makes a nasty clashing noise and nothing happens. I will point out that I drilled out my bitch pin hole and tapped it out and replaced it with a bolt, could this have thrown off the alignment of my linkage? it’s not loose that’s for sure. I’m confused, exhausted and pretty pissed right now. Hope someone has ideas or has unfortunately experienced this before…
replacing the expanding pin with a bolt - yes. that will cause it to not line up correctly. it’ll have slop where it’s not suppose to.
you pretty much tightened an oval onto a circle.
that can simply be one of the problems. did you or whoever installed the shifter rods & forks install them correctly?
There’s no slop though, the bolt holds the linkage to the rod 100%… And I assume I installed them the correct way, it seemed impossible to install them upside down because the collars wouldn’t line up and the case wouldn’t go on…
Update:
I think the piece that controls the forks isn’t installed properly. It’s the only thing that makes sense to me. I took the car for a drive and the only gear I could use without issue was 2nd. If I tried to make a gear change to 3rd it would engage, but it sounded like another gear was dragging. Looks like I gotta tear apart all my hard work again :vomit:
Definitly the reason why I pay someone to go through my trannies… I’ll rebuild my own motor, but won’t do anything more than crack a tranny open to make sure the gear teeth are present… beyond that, I’m retarded when it comes to transmissions.
Yea kind of disappointing. I like to do things myself, and I was confident I swapped things piece for piece. I know the gears, synchros and lsd works, just I wasn’t cautious enough with that piece of the transmission that controls the forks. I’ll know tonight when I have it on the ground and cracked open.
Solved it… I sucked it up and ripped it out quicktime, cracked the case and compared it to the old tranny… Found out I installed the reverse gear/collar upside down :loser:
For anyone looking at this stuff later, I’ve also found a lot of times you can have major issues installing bearings upside down as well.
I’ve found that taking lots of high res pictures and having a large workplace that won’t be disturbed is key. As long as you are methodical and organized, it really isn’t that hard to rebuild our transmissions. Although I do know Honda mechanics who are leery about it and troubleshooting when there is a problem after the fact is kind of a pain. I’m glad you were able to figure out the problem without destroying anything! 