Rear clunking @ throttle lift-off. IE Bushings Culprit?

[WhatWentWong]

Hey guys,

I've always had clunking coming from the rear end during crawling stop-and-go traffic, or during low speed throttle lift-off. My car has IE green subframe bushings. I cannot recall if this noise came in after the swap or had always been there.

Somethings I ruled out:

- Diff was swapped, but all bolts are tight.
- Diff bushing is a solid piece, so no chance of flex there.

Are IE subframe bushings (or any stiffened poly or aluminum kind) known to clunk like this? Will there be damage if I allow this clunking to continue?

Thanks,

Lincoln

[E30_fiend]

I have had the same thing happen to me. the culprit was the CSB. not to mention the noise YOU may be hearing might be the play of the input shaft on the diff. Or quite possibly the play in the output shaft of the tranny

[manjambles]

i have this prob too and i swapped in a viscus 4.10 lsd.

i found in my resto e30 book that the med case lsd have this issue but it will last forever making that noise

[BTP325ic]

fuck VLSD,LSD or welded end of story.its probably your diff have you taken it off yet?

[yert315]

It does sound like a CSB (center Support Bearing for the drive shaft). If the bushing in this wears out, it can cause the symptoms you described.

[wolfgangstbd]

csb could be a culprit or just a bad drive shaft. the knuckles can be binding which cause the loud clunks you hear. a new CSB will lessen the effect of the problem but it wont fix it. b/c if the knuckles are binding or the drive shaft is unbalanced it will just wear out the new CSB sooner. i have the same problem but my friends dad(mechanic of like 20 years) said you can drive on it for a while so when you get the money and time to fix it go for it!