Help needed.

I have a really loud 'crack' noise from the n/s rear suspiension when going over a pot hole / speed bump. No play in the bushes.

Got the wife to jump about a bit in the boot ( oh err ) while I was underneath the car. Noticed that the shock mounting bolt was VERY loose in the bottom rubber bush. noise seemed to come from the mounting bolt for the rear arm, but not sure.

Anyway pumped a bit of oils on the moving bits and the prob got better on small bumps, but still really loud on speed bumps.

Anyone got any ideas ???

S