housze_rulez

iTrader: (1)

I have an '04 with 64.5K miles, 6MT.

I changed my tranny and diff fluid at 60K. I'm currently using Redline's MT-90 and 75w90. Recently, i've suffered from grinds when shifting 8K RPM and up. It's a hit or miss between 7-7.5K RPM. No grinds during daily commuting. Here's the kicker, at about the same time i've began to have grinds, my car threw a pending code for a bad cat (P0420). However as of late, the code vanished and has not popped up. No power loss whatsoever, as far as I can tell anyhow.

Should I go back to OEM fluid? Do I have a bad synchro or pilot bearing?

Dillion Phelps

i have a somewhat similar issue.

If I try to down shift from 3rd to 2nd it almost all ways grinds.

JFoltz

same exact thing, i was going to have my trans fluid drained and filled. PM me if you find a solution!!!!!!

housze_rulez

iTrader: (1)

bump

hoosier1104

iTrader: (2)

Could be your clutch is not able to handle the high rpms any more. That is where I would start.

housze_rulez

iTrader: (1)

Perhaps. Do you think these two are related? https://www.rx8club.com/series-i-tro...6/#post4612400

hoosier1104

iTrader: (2)

Replace your clutch.

housze_rulez

iTrader: (1)

Okay, i'll do that and report back here. I'd like to add that I don't grind if i double clutch. I'm just hoping I don't need a rebuilt tranny.

Harlan

iTrader: (3)

Don't replace the clutch yet! Check clutch play first and also inspect the clutch pedal bracket for signs of breaking.
Here under clutch adjustment:
http://foxed.ca/rx7manual/2003mazdar..._S01_0498.html

And here to check for breaking:
https://www.rx8club.com/series-i-do-...al-fix-170387/

Throwing a new clutch at the problem without properly diagnosing it is a waste of money.

housze_rulez

iTrader: (1)

Great info, Harlan. I believe the assembly is fine, it doesn't move left or right, go at an angle or make a squeak.

Harlan

iTrader: (3)

You may not be able to tell without looking at it, everything else is a symptom not the problem. Just take a flashlight and wedge yourself into the footwell until you can see it.

Also don't miss the first link on clutch pedal play, it might solve your problem.

housze_rulez

iTrader: (1)

Thank you for the clarification. I'll do so and let ya'll know how it goes!

*edit* I think the synchro in 3rd gear is worn. When I double clutch into 3rd at 8.5 grand it doesn't grind.
Displayed is RIWWP's symptoms and causes for my particular problem. I guess i'm going to live with it until I can get my tranny rebuilt or get my hands on a Series II transmission.