Noises...no idea where they're from...

[Sean]

If it's the diff it will need a rebuild. But also check that the drive shafts (the splined end that goes into the diff) Has plenty of grease on them. When they are dry they cause a whine too...
Drop the whole rear sub frame. It is much easier to do when it's all on the floor.

What are we talking for the rebuild, how difficult is that?

[zaust]

I personally don't on on with diff's very well, but to someone who build's them regulary it will be half a day's job. I had mine rebuilt by a friend and in return i fitted a cage for him.
Was 2 and a half hours on my part and he had rebuilt my diff in that time. He also threw in a couple of extra clutches to obtain a 70% lock ':) . Shame your not uk based as I have 8 lsd's for sale....