ElkySS

iTrader: (6)

I have a viper shaft t56 with about 3k miles since build. Lately, it's been making an odd noise and I'm trying to determine if this is a clutch issue or an internal trans issue.

I'm running a new SPEC 3+ with a freshly machined SPEC steel flywheel.
It makes the noise under the following conditions:
While coasting to a stop with the trans in gear with the clutch pushed in.
It does not make the noise when in neutral.
I can stop the noise by placing the trans in neutral and letting the clutch out
It will continue If I put it back in gear while moving with the clutch pushed in
Under no circumstances will it make noise with the clutch engaged.

The noise sounds like a bad throwout bearing but its not acting like a typical throwout bearing issue. Anyone got any ideas?

stevieturbo

Does it make a noise with clutch pedal down, car in any gear and vehicle stopped ?

ie there will be no moving parts in the trans at this point.

Although from your description, release bearing does sound likely.

ElkySS

iTrader: (6)

Yes, if i coast to a stop with the pedal down in gear, it will make the noise until I take it out of gear and let the clutch out. Then it won't do it again unless its put back in gear. It's also intermittent. Hasn't done it in 2 days.

2000 WS6 Formula

It's the Pilot bearing.

Firebrian

Google neutral gear rollover noise/rattle? Pretty common after installing a fresh clutch and/or engine upgrade. Every manual trans has the issue though most are subdued enough they aren't easily audible. Engine harmonics are passed into the transmission when it's unloaded. Should disappear once above 1800-2500 rpm. Though, wouldn't expect this to be intermittent.

ElkySS

iTrader: (6)

Going on day 5 with no noise and driven everyday. I suppose I'm just not going to worry about it for now.

I did put a new pilot bushing and input shaft in when the trans was built.

therealcreeper

iTrader: (37)

Sounds like the exact same symptoms as my failed pilot bearing

ElkySS

iTrader: (6)

The noise came back. I noticed some new things. If I'm at a dead stop, I cant push in the clutch and the noise comes back if I put it in a higher gear like 3rd or 4th but goes away slowly if I put it back in neutral with the clutch still pushed in. It goes away immediately when i let the clutch out in neutral.

I'm pretty sure its the pilot bearing at this point but I'm really hoping I don't have to pull the trans again. I'm running GM Syncromesh with carbon sycros. Any chance that could be the issue?

AMP-D

Did you use a bushing? If so, that is the problem. Put a GM brand pilot bearing in it.

ElkySS

iTrader: (6)

Yea, I used the pilot bushing that came with my SPEC clutch. the last bearing I ran destroyed my input shaft so I'd like to stay away form those.

This is an LT1 T56 btw

AMP-D

Bronze pilot bushings suck. I personally never use them over a quality roller bearing with some extra high temp grease pushed into the rollers.

stevieturbo

It really shouldnt make any odds one way or the other unless you spend shitloads of time with your foot pressed on the clutch

Which is just very bad driving, so dont do it.

RidetechJosh

I've never had any luck with the bushings either. They always seem to go out quicker so I've stuck with the bearings and they seem to be better/longer lasting.

AMP-D

The material is too soft in the modern bushings that come in these kits.

ElkySS

iTrader: (6)

Alright, Guess I'll try a bearing again. Which one have yall had good luck with?

AMP-D

Go GM/AC Delco original equipment.

ElkySS

iTrader: (6)

I don't believe LT1s had a factory bearing

AMP-D

Sure it did. Its the same bearing as the LS1 small bearing.

Blake Chambers

Blake Chambers