I got my 1.5way Kaaz 2nd hand from a SAu member last year and while it ran quiet in his 34 GT-t coupe after a textbook install & run-in procedure, once in my 34 sedan it clunks, shakes and sways the rear end of my car quite violently at times.
The workshop that installed it for me used LS90 which i left in there for approx. 500Km's before changing it out for Kaaz oil. For something that clunked as much as this diff did there was no metal fillings to be seen. The Kaaz oil has been in for about 9-10 months now (approx. over 4000Kms) and I'm considering changing it out for a thicker nulon or motul diff oil, something the previous owner recommended to soften the clunking.
It's been a strange but awesome addition to my car though as it provides great drive when powers applied at the right time locking the diff with no clunking. The strange part? it doesn't matter what temp the whole combo is at, cold, warm, hot - sometimes it's pleasantly smooth and quiet and other times it feels like it's going to shake the rear cradle out of my car.
So thats my history with the above diff centre. Should I change out the Kaaz oil for whats been mentioned or leave it in there?
Reggie.