replaced rear main seal put new clutch in and rest of car back together, it was not that bad a job, ok so i lie it was a pain in the arse.

start the car up and there is a rattle coming from the gearbox that was not there before and at first i thinking it was the thrust bearing so we droped the box again, the new thrust bearing was not that flash and had it replaced.
so new clutch kit double check every thing and put clutch/gearbox in and again same rattle

i drove the car round the block and all gears are fine and transfer working.
any idea's