Do you mean the universal joint (the bit that comes out of the bulkhead at floor level, on a VR6 next to the drivers side engine mount)? If so that should be covered by a rubber boot!
I should mention my top bush does still make a bit of a noise, but thats not what the noise was when it went into the garage. I reckon when it was in the garage and they were looking to for the cause they moved something that was rubbing and so the noise/vibration stopped!
Maybe try just having a fiddle with the universal joint and see if it helps. Oh and if it is the UV that needs a rubber boot get one as soon as you can!!
