Bad Transmission Syncro Question

[NeWyoRksPLaYaZ]

Sup guys, I have a known bad 2nd gear syncro. I noticed after a cold start(if the car sat for 5+ hours in cold weather) after I start my car and its at operating temps, I can shift into all my gears smoothly and it feels like it clicks into gear(which feels nice ). Also it doesnt grind one bit when its cold but as I start driving it slowly goes back to the crappy grinding. So I was wondering, can I drain the current fluid and put in thicker oil since when its cold its probably thicker and thats why it doesnt grind much and it probably thins out as it heats up while I drive. Could this be a possibility??

 

[driftingalong1]

it might work as a temporary fix but your just masking the real problem.

 

[Colt4G63 also]

Usually it's the opposite. The thicker fluid makes it harder to shift, and they generally shift easier when fully warmed.

What kind of fluid is in there?

 

[NeWyoRksPLaYaZ]

I plan on buying another tranny sometime next year but for the time being I would like for the grinding to be reduced. As far as fluid, I have no idea. Whatever is stock I guess.

what fluid is in the gst's tranny? Do you think it will work?

 

[moronthr33]

I do believe its 75-80 or 75-85. You can also try adding Lucas oil additive.

 

[Colt4G63 also]

It should shift best with thinner fluid. Most people have really good luck running Redline MT90. It helped my shifts. Of course I had goofed and put GL-5 in my transmission, so anything would have probably shifted better than that.

I couldn't get my car into second worth diddly at the shootout last summer.

 

[Rob88]

switch to MT85 redline. that is the proper fuild. not MT90. MT90 is harder on the syncros MT85 is actaully designed for the syncros in the mistsu trannys. ive talked to a redline rep on this and you def want to run MT85. MT90 will work good but the syncros last longer with the MT85 and it will work better.

 

[Colt4G63 also]

^Wow! You're right. I'm going to switch. Thanks!

 

[cdkelly91]

I don't mean to hijack or anything but I have lots of trouble shifting at high rpm. Would this be normal or the signs of bad synchros. I know the synchros in the mitsu trannys use paper/organic material so the redline 85 is ok to use?

 

[pauleyman]

A fluid may help but it may only fix the symptom for a little while. The root cause of the problem is likely a worn synchro. It may not seem like a long time but you have a 14-15 year old car. The synchros themselves are not expensive but the labor can be. Typically you'll find worn hub/sleeves and/or worn gears. If the synchro can't do it's job it makes it harder for the fork and rails to do their jobs. It's one big interrelated system and unfortunately the usual solution is to replace some parts. The first suggestion is typically to try a different fluid, adjust cables, clutch etc and those are all good things but if you know the external systems are working properly then you may have to consider the age of the car and plan for whatever repair is necessary. My approach was get some tools and do it myself.

 

[NeWyoRksPLaYaZ]

I understand that and thats fine. But it definatly shift much smoother when its coming out of a cold start so for time being until next summer when I get rid of this tranny, I want for it to be a little easier shifting. I think ill buy a thick type of oil and see what happens.

 

[eclipsekid328]

my second gears has the same grind how do i fix that?

 

[sciondan]

I have tried all kinds of different weights and kinds of oil. I'm in the same boat as you, my second gear syncro is shot. The best i found was stock oil and weight. The damage is done so oil will not fix it. What i'm doing until I get my replacement trans is double clutching into 2nd. As long as I double clutch into 2nd I don't grind. I recommend doing this until the problem is fixed so you dont damage your tranny any further.