AE86 diff problem

[cj]

Okey dokey, here i am with a diff problem again. I haven't driven the car very much since the last assembling (http://www.aeu86.org/viewtopic.php?t=2987) - maybe about 100-200 km only. This is mainly bacause the car was in a shop for a front lower arm raplacement. Yeasterday, i took the car back and went out for a drift practice. What happen is that when the wheel started to overspin, a metal scraping noise appeared suddenly in the back. I tested the prob a little and when found out it's not my imagination i drove straight to garage. The noise only appaers under heavy load (drifting, wheelspin), i cannot hear it when just cruising even at higher rpm. I though i broke one of the halfshafts again. Today the mechanics took one out - it's ok. Their guess is something that very surprised me - housing wear. So far i haven't heard of anybody raplacing the diff housing, simply because of inside wear. I'm confused and don't know what to do. I was about to order brand new KAAZ 2-way LSD, but i'm afraid that i may waste the unit. Any advice is widely accepeted.

To anyone who have succesfully performed an overhaul procedure, please, give me a brief step by step of the process and parts raplaced.

I already had the diff overhauled when i first bought the car (3 years ago and about 5000 km of "amateur racing"). Something was surely wrong since that's when the diff came out 100 locked.