Well after doing a fair amount of research it appears KAAZ are not quite all they are cracked up to be, pretty good but still could be better, so it seems the answer lies with a HARROP TRUETRAC. these diffs seem awesome and virtually indestructible for the same price as a KAAZ. No running in, No noise, No special oil.... what more can you want.
But as usual they are out of stock and may take a few weeks to get one and I need the ute going now... Swallowed the bullet and fitted a mini spool as it was a cheap way to get going while I wait for my TrueTrac....
I also fitted a set of 3.91 gears to get it's arse off the line a bit better and I can say the improvement is very noticeable. Should reduce those 1/4 times a bit now if I can just get the gearbox sorted.