Rear end chattering and clanking sometimes

[Oxy-]

Hello all!

I've been out early morning today to open summer driving season Had done a few sporty drifting laps and after some time when returning home I was faced with these new awful sounds coming from the end of my 325e 86':

1) when cruising (no gear engaged) >40kmh a strong chattering and a feel of vibration emerges from the rear of the car used:
if I engage a gear and accelerate or decelerate (stopping car with an engine) it almost disappears;
if I press the brakes - it almost disappears;
if I change the gear up/down, at the time when there is no gear I hear the chattering again.
Shortly, it seems that the chattering is coming when there is no tension in the drivetrain.

2) when starting from a standstill I hear CLANK! (or BANG!) : then the car runs fine (until I reach middle speeds)...

I have inserted a viscous LSD differential a few years ago. Also had done a major rebuild of it (in order to make more lock) two years ago. And it worked great. Hope it's not a diff... I would suspect the diffs U joint, but then why it appears when cruising and not viceversa?

Hope for your help,

Thanks!
Oxy-

[Oxy-]

Wouw... I got under the car, everything arround the diff seemed fine, then jacked up one wheel, then another and what a surprise - it was loose! The wheel bolts where loose Everything solved after just tightening them!

[ldsbeaker]

wow, good thing you were listening to your car!

[Starmavin]

Sounds all most like a bad or broken trans mount. And/or it could be that your differential or it's mount has come loose from the rear cross member and/or body...