Alright, so recently my car started doing something odd...At 4000 rpms and up in 3rd and 4th gear my car has a terrible vibration/rattle/grinding noise that comes through the shifter. Like, it is as loud as when you grind a gear or something, not a subtle vibration or noise. It has to be something tranmission related, but I'm not too familiar with the internals on transmissions. It just randomly started doing this. No missed gears, or grinding gears, or anything like that happened that might cause it.

Any ideas? The trans is a Tick stage 2 T-56 with a Monster stage 3 clutch.

I know the tailhousing on my transmission has a leak around where it mates up to the main housing, but I don't think it's leaking bad enough to be low on trans fluid yet. If it was, could that cause my noise? I'm going to check it the next time I get a chance to look at the car.

 

My car does that once in a while also. I figured it was the crazy LT1 throw out bearing that always spins with the clutch sitting in a different spot on the pp diaphragm. After a recent clutch/flywheel change that was slightly out of balance my shifter rattled as you described from 3k on up.
EDIT just saw you now have a '01, I just looked at your screen name. Disregard the LT1 ref.

 

Yeah the 97_ek was referring to the car I had when I joined this forum. A 97 Civic :/ I've just never messed with changing it.

I may try to take my shifter apart to see if the bottom shifter ball bushing may be worn out causing the issue. Apparently another guy on here had a similar situation, and that was his issue. Sounds like a good reason to upgrade to an MGW

 

I had a bad rattle at higher RPM's. It turned out to be the Hurst shifter **** of all things! It was not loose, the jam-nut was tight and you couldn't wiggle the ****. It has something to do with the brass insert in the plastic ****. I took it off and tried it, the rattle was gone. Put a different **** on, it was all good! So try taking your shifter **** off first and try it?

 

That makes perfect sense. I just took my shifter **** off not too long ago, and it started right after that. I will try that tonight if I drive the car. I still need to use this as an excuse to the wife to get an MGW shifter

 

I looked all over the internet to locate methods to silence my shifter noise which is present in all forward gears and in neutral. The various sources of noise and remedies I found are listed in the thread below. Your issue seems more localized though only being on the 3rd/4th gear spool. 3rd gear is where mine is the noisiest. I'd also check to see if you have the neutral gear rollover rattling (clutch engaged in neutral - trans gears rattle from engine output shaft). You may have to keep all windows up to hear it. It goes away with the clutch pedal pushed in.

https://ls1tech.com/forums/manual-tr...ots-ideas.html

 

Thanks for the link. I'll take a look at it shortly. Last night I took the Hurst shifter **** off and ran it up to high rpms in 3rd and the rattle was gone. Thanks for that information.