You got a R200 right?
Goto Nissan Buy some shims, part numbers are all over the net, Drop the diff, Put a shim in either side of the spider gears.
Sorted mate, will easyly last you the day and prob alot more. Cost you about 20bux plus the oil to refil it.
Gunna have a Talk to DVS32R (aka Jez) We will prob seeya down there, ill prob trailor my car down, jst incase it breaks, from wakie to the central coast = MEGA tow fee. haha