vibration/knocking from rear setting off

[cjdonny]

Unless setting off very slow
318 is
Had the rear shocks replaced/top mounts arb bushes and prop bearing/rubber

Diff does have a wine

But could this be down to needing the axle and railing arm bushes replaced? Look warn cracked

Rear steps out very easily

Also have a rear strut brace fitted

Car did this when I got it before changing a few of the above but seems worse now had it 10 months

[daimlerman]

I'm a bit like your diff,I like a glass or three of wine...

On a more serious note,have you checked the four diff mounting bolts?
If these are loose,you will get a knock from your rear...

[cjdonny]

Haha yes its a wine red car too

Will check thanks

[H35-24]

What about the diff bush and 2 rear subframe bushes in front of each rearwheel, have they been replaced?
Otherwise that is a normal place for an E30 to wear out. Where I come from the MOT guys allways start at the rear subframe bushes, it's very easy for the trained eye to see if they're gone. (I don't have an example right now). But if you talk to someone who knows the problem then they can show you.

The trailing arm bushes, I have never seen one that is bad, sure they might look cracked etc. but usually they are fine. But if the other stuff doesn't do the job.

The diff can also be very worn and have considerable play in it.

[cjdonny]

Its had a poly diff bush
But It does want the rest of the rear bushes done I have the poly kit ready to be fitted.
Mot is next month too so will see what she fails on

WIll check the diff mounting bolts at the week end.

[Chris_B86]

Check rear subframe bushes and rear suspension top mounts

[cjdonny]

Top mounts are new

I'll put it down to diff bolts or rear subframe bushes