Ok, here is the deal. My 3rd gear on my Y1 JDM tranny was starting to grind so I pulled the tranny and had the parts 1, 2 and 4 changed from the picture below. Got everything back together as well as a new clutchmasters stage 3 clutch kit and an ACT prolite B-series flywheel.

After the break in period and a few hard shifts on the street, everything was fine. 15 minutes on the track and the 3rd gears starts grinding again, just like before. Bitchin'.

Pulled everything appart again and we discovered that the step on the flywheel was 0.04'' too much wich caused the clutch never to disengage fully. This is being fixed as I write this.

My question is, the actual parts that matches the revs of the gear to that of the shaft (part 2 of picture below) are good as new, they have been checked. I always believed that a gear would grind when those parts were worn out. I guess was wrong. How do you guys see it?

From looking back at everything, I believe what hapenned is that I missshifted in 3rd on the track with the foot down on the gas due to the flywheel-clutch problem described above, which caused the ring (part 1) to be damaged. Then, everytime I would shift, the ring would not seat properly on part 2 and slide right away on the gear (part 3) before the revs were matched, which causes the permanent grind.

Any input on this?

Here are the pics:

 

nobody works on trannies here?

 

Try the tech forum?

 

your gear looks fine, and if the syncros are still good, i'd put it back together, and fix the clutch issue, you should be good after that

 

i'd actually disagree, and say the gear looks pretty fubared. the synchro teeth on the gear should be pointy triangle shapes - yours arent. they look really worn (rounded). considering the relatively cheap cost of the gear (since you can do it all yourself and it's already apart) i'd say hell, change it out for a fresh one.

it's hard to tell, but your ring looks ok from the picture. if it and the syncro cones look ok, i wouldnt worry about them. . ..

 

acutually , yeah your right, the syncro teeth should be a bit more pointy

 

Right, but the teeth on the gear should not make the tranny grind. It only grinds there when it grinds though. If you look at the way the trany works carefully, when engaging a certain gear, the teeth of part 1 force against the teeth of part 2, matching the gears. When the speeds are equal, part 1 goes through and locks up on the gears teeth. If the gears on part 1 are rounded, which they are, the teeth of part 1 will not seat properly on the teeth of part 2, and will therefore slide through before the gear speeds are matched. That's the way I see it.

Therefore, I believe only parts 1 and 2 would make the tranny grind.

 

I have a tranny from an ek that I might be able to pull some parts off. If you're interested, send me some measurements and I'll try to see if the parts fit. I won't charge more than a few bucks + shipping.

 

I'll be fine with the parts, thanks. I don't really have time to wait.