I've put in my own gears, headers and cam. Why not fix this problem too....

My trans is rattling like mad in neutral (quiets up right away when I push in the clutch). How bad of a job is this? Does anyone have any tips / tricks? Does the clutch need to come out? Any help is appreciated.

Thanks,
Scott

 

Yes the clutch has to come out...the TB is pressed into the back of the crank, very snug too...

You will need a bearing puller to get it out and a good size sledge hammer to install it. Just grab a socket that is about the same diameter of the TB and just tap it in slowly. That's it...

 

Well, I've never replaced the clutch or throw out bearing in my M6 Z28 but I have replaced a lot of others. Are you talking about the THROWOUT bearing or the PILOT bearing? The pilot bearing is pressed in but I've never seen a throwout bearing pressed in. If I'm wrong someone please educate me.
Either way the trans HAS to come out.
Ron

 

By the description you mentioned I would say it probably is the pilot bearing, not the throwout bearing. The to bearing would make more noise when the clutch pedal is pressed, engaging the to bearing. If it is rattling and making noise in neutral it is more likely the pilot bearing. The pilot bearing is in the back of the crank, its where the input shaft of the trans is centered in the back of the crank. The to bearing is what moves when you press the clutch in, the clutch fork pushes it against the pressure plate "fingers" to realease the clutch disc.

It's basically a whole clutch job to get to the pilot bearing. The trans, belhousing, clutch & pressure plate all need to come out to get to it. I've done it a couple times now in mine, it's not that bad of a job. If you can do the other mods you mentioned yourself this isn't much harder.

 

Yea, sorry I got the two mixed up...

I described the process of changing the PB...Gregg97z is correct about the TB...

Sorry for the mix info...and I hope it didn't confuse ya. Cory

 

The T-56 uses a "pull" clutch where he TO bearing pulls out on the pressure plate. It's different then conventional clutches. If everything is stock you will have a brass pilot bushing. I replaced mine with a roller bearing.

When you have the clutch pedal out the pilot bushing/bearing isn't being used as the trans input shaft and flywheel are spinning together.

When you have the clutch pedal pushed in the trans stops and the pilot bearing/bushing is being used the most.

When you press in the clutch the trans stops spinning. Perhaps you have a bad bearing is bad on the trans?

Carlen

 

I have yet to experience an M6 that doesn't rattle in neutral or on low rpm take off. Its supposed to be a normal thing, and wasting time replacing your pilot bearing probably won't net you any results. Good luck.

 

There are posts about low RPM takeoff rattles. I think it may even be in the f-body FAQ's. However the transmission should be quite when idling in neutral.

 

This is my personal experience with 3 M6's. In neutral you hear a rattling noise but as soon as you push the clutch in the noise goes away. I'm pretty sure its supposed to be a normal thing, but like I said its just my personal experience.

 

SSbowtie1, I think you're right.

I looked in the fbody FAQ's and it mentions the rattle in neutral at idle.

Q: What's that rattling noise from my manual tranny upon acceleration?

A: This is a common problem among 6-speed cars. GM is aware of the problem. The faint but distinct rattling noise can usually be heard with the tranny in neutral and the clutch out. A few quick revs at about 1/8 throttle and it should get louder for a fraction of a second, then disappear, and then return when the engine drops back to idle. You should also be able to hear it when starting out in first from 0-10 mph.

 

This is exactly what I'm trying to fix. What is making this noise?

Thanks,
Scott

 

Sorry I should have posted the rest of the answer to the FAQ.

Unfortunately, there's no Technical Service Bulletin or recall to address this problem. But GM does know about it. In 1993 and 1994 cars, the GM Tech Assistant Group (TAN) called for the dealer to replace the clutch with a revised one. Two different part numbers for the revised clutch were found, (12551803 and 12551809), but no one is sure which is correct or if they really exist. 1995 and later cars are supposed to have a revised clutch (part #12551309), however, even people with these cars report to have same rattling noise. As of now, there seems to be no fix for the problem. It's even accepted to be normal by most dealers considering no one has reported any abnormal wear or damage which might be related to the noise.

 

What he said.

It used to bother me alot but I've gona many miles on many M6's that make that noise and have yet to experience a problem with them, so basically I just learned to live with it. I believe it has more to do with the input shaft than it does with the pilot bearing, so unless you want to dig into the trans and start trying to diagnose the issue, I would just leave it alone.

 

HELP!!!!!!!!!! I just installed a chrome molly F/W kevlar clutch and Presser plate with T/B, and here is my problem The clutch fork came off during the sliding of the trans back in I have tried to put the fork back on the t/o bearing with out having to pull the trans back out, I have tried pushing praying and hitting it but it will not go back on! Someone please help me What am I not doing right.