My 92 '40 developed a very annoying clunking sound in the rear suspension. On every bump you can hear and feel a clunk and when breaking hard you feel the back end of the car shaking. After checking the rear suspension I couldn't find any play on it, so decided it must be the foam-rubber bushings that had worn out on the shock absorbers and the upper spring 'donut'. Disassembled the spring-shock assembly and found the following nasty surprise:the poly-urethane shock absorber bushing (CBC2933) had worn out and the metal bushing within had started hollowing out the upper spring cup (MMD3570AA). I've got an 'emergency' order at SNG Barratt for a grand total of €500, €211 a piece for the spring cups and €38 a piece for the bushings.



The badly worn out CBC2933 poly-urethane bushing


The hollowed out upper spring cup

Lesson of the day, don't ever say 'this goes surprisingly easy' before actually finishing a job. It's clear where the clunking sound came from though..

 

I have had to deal with this and the customer did NOT want new spring mounts.
I simply swapped them side-to-side so the load was on the opposite side.

Car was quiet for years. I don't know if it is still 'running-around'.

 

Yes nasty and common problem. Got a good second hand couple from a local jag wrecker. Suprised the poly bushing died. Remember to replace the lock nut when doing it all up at the top, and tighten till it stops.