every morning when the tranny is cold, when i shift from 1st to 2nd the gears grind but when i shift from 3rd to 2nd it goes in smoothly. but when the tranny is all warmed up then all gears go in smoothly...it just grinds when its cold..the oil i used is gl-5 80w90...any suggestions??

 

Your 2nd gear synchro is probably just starting to wear out. Its common for higher milage trannys and nothing to really worry about for now. Just shift slow and match revs when its cold to avoid further damage.

 

so i should shift slow from 1st to 2nd and rev match from 3rd to 2nd? also the oil im using is gl-5...should i change it to gl-4 or just keep it the way it is?

 

I experimented with Synchromesh.
It helped a little. Well, It doesn't grind anymore, but the 2nd gear shifting, which never grinded, but was just a bit not smooth, - - was a little cured..

 

holy crap, i thought i was the only person having this problem.......lols well my tranny was just rebuilt so i'm hoping the syncro doesnt suck already, but i'll match it when i shift and wont ride to hard when its cold

 

should i stay with the gl-5 that i already have in it or should i switch it to gl-4?

 

Try using ATF in your tranny.......i had a bad grind both from 1st to 2nd and from 2nd to 3rd, i'm talkin llike you couldn't even baby it into 3rd gear without it grinding; but i put ATF in my tranny for like 500 miles then drained it and filled it again just to get all the gear oil out. Butr after that it was golden.....i can slam it into 3rd when i really get on it and no grinding anymore.......i will warn you, the person that told me about using ATF in there said it should be changed every 1000 miles...BUT...i have gone up to 5000 miles on the same fluid, always comes out clean when i flush it with minimal to no shavings on my magnetic drainplug....good luck.

 

bump...anymore advice?

 

Read...

https://www.rx7club.com/showthread.p...&highlight=gl5
https://www.rx7club.com/showthread.p...ht=gl5+sulphur

 

not to thread jack but my syncros are the same way and will probaly need replaced like yours but is there any aftermarket places that sell carbon fiber or kevlar syncros for TII trannys... you probally dont wanna put the stock ones in again if you drive it hard like i do

 

an FYI......the length of the throw from 1st to 2nd is the longest of all the throws in the trans......the shift between the two is usually sketchy when your tromping on it.

 

In my experience, there's a few finesse points to shifting that help. (My 1st gear synchro is average, 2nd is bad, 3rd is dead.) (S4, NA, 5spd, stock flywheel.)

N > 1st: Push in the clutch, wait a coupe of beats, then put it into first. This lets the intermediate shaft spin down to 0.

1st > 2nd: First gear, go to 4k rpm, pull the gear lever straight back to second, constant motion, medium speed. If you get it right, it'll pop right into second.

2nd > 3rd: Second gear, 3.5k, neutral, let the revs drop for a beat (about 2.5k rpm), then put it into third. (If at the redline, wait 2 beats, ~ 4k rpm) Double clutching helps with the timing.

Any downshifting or entering a gear at speed requires a rev match in neutral. Rev the engine to where the RPM should be for that gear, then move the gear lever into gear.

 

check your gear-oil level, maybe needs a little.you can put a little of 22w-50 oil .

 

how do i check it?

 

Get under the car. There's a 14mm box looking thing. Unscrew it, this is the filler, as well. Stick a finger in. The fluid should be level with the bottom of the hole. If it's low, fill it up till it starts to come out, then screw it back in.

James

 

Don't stress out bro, unfortunately this is normal in our car. The hard shift will disappear as soon as the fluid warms up. So, either wait a few minutes and let it warm up, shift from first to third if you can't wait, or replace the second gear synchronizer ring and 1-2 clutch sleeve with redesigned ones(yeah right!).

 

Hmm, weird. I actually grinded when my old fluid warmed up..
Im using SynchroMesh now, alot better.. I'm a little concerned though, seems thin.

I've read somewhere, the thicker the fluid, the harder it'll shift, but'll save the synchros and bad for tranny..some **** like that.. and the thinner is bad for Synchro but good for tranny.. I'm not sure about this. hehe..

 

I had a similiar issue with my FB, I changed over to synthetic 80/90w and made a big difference. You could put atf in for a bit before changing it, that will help. ATF has high detergent properties and will help clean the internals a bit.