Ironxcross

iTrader: (8)

I've been trying to track down my lash issue, trying to figure out which component is giving the whole driveline a sort of loose feel and hence a "clunk" on shifting.

Upon inspection, I found the noise is primarily coming from the transmission. What could be the issue there? What could be loose in there that would cause a clunking sound when I'm shifting?

Ironxcross

iTrader: (8)

anyone?

thesource

iTrader: (60)

Could be a number of things. What flywheel do you have? Does the car have a large camshaft? What shape is the clutch disc in? What shape are the U joints in?

Ironxcross

iTrader: (8)

stock everything. new u-joints. clutch has 111k on it.

thesource

iTrader: (60)

Could be a broken or worn out spring in the clutch disc.

Ironxcross

iTrader: (8)

Thats funny that you say that. The guy I took it to get looked at said it was either the clutch springs were going bad or broken or that the cluster in my trans was getting worn (not his exact terms but the best I can remember).

Hmm.. so this whole business could be as simple as a clutch?

Gen414

iTrader: (38)

Maybe, but also have to figure out that without us "hearing" it, hard to diagnose.....have to throw out some other things as well...tranny mount? Motor mount? Exhaust hitting crossmember? TQ Arm bushing worn out? Loose? ALOT more stuff down there to look at/think about....

Ironxcross

iTrader: (8)

Hmm. Fair enough. I'll elaborate the details where I can:

New U-joints
New Trans mount
New torque arm bushing
New LCA bushings

The motor mounts are old, but they do not seem to be the culprit.

Everything in the rear suspension and trans mount area is tight and has blue locktite.

I had a new rear and driveshaft in the car (part of 9" rear adventure I had back in summer) and it still was "clunky". And after I switched back it was still clunking.

To describe the clunking - it happens in every gear, if I shift normally (in and out) the car will buck and have an audible noise when the drivetrain is engaged. I usually feather the clutch a little on each shift to avoid this, it sometimes works.

So. This would lend itself to something in the transmission or clutch.

Things that make me think it might be in the trans or clutch:

Some difficulty in changing gears (not smooth but not impossible.. notchy I suppose)

Clutch engagement is on the last part of the pedal (not sure if this is normal but from other cars this signifies a worn clutch)

Taking off from a stop the clutch feels "loose" almost. If you feather it, it works. If you quickly release the clutch (not dumping it) with a decent amount of RPM, there will be some bucking (but its NOT like if the car is about to stall)

Confusing but the more I think about it, the more it sounds like a possible clutch issue.

thesource

iTrader: (60)

I doubt its the cluster gear inside the unit.

Ironxcross

iTrader: (8)

What would be the symptoms there?

thesource

iTrader: (60)

If the cluster gear was worn enough to make a gear chatter, you would definately hear gear whine in all gears except for 4th gear going down the road. I'm going to stick with my gut feeling and say its a clutch disc spring issue. Like Gen414 said though, without hearing it, its just an educated guess.

Ironxcross

iTrader: (8)

I'm heading to the clutch idea as well.

Theres no reason the trans should be having any issues, its not abused at all. Nor was it ever abused. Just driven. Not even powershifted, haha.

So where is a good place to get a LS7 clutch kit?

Furious_George

iTrader: (12)

scoggin dickey parts center still has decent deals on their sets...even have one with an aluminum flywheel for about $100 bucks more. wish that one would've been available when i got mine. the steel ls2 flywheel is heavy as hell. i'd either go with those guys or check the classifieds on this site. they pop up every once in a while.