Outer Limits 4x4 Board

Mech has done a fair bit of work on the rear diff, replaced the pinion bearings spider gears and pretty much everything except the crown wheel and pinion. The whine is still there, so it looks like they have to be replaced. Any tips on where to get in around melb, or pick one up from the wreakers and swap bits around to match the new stuff?
Also what the standard ratio is, ie if I spot one for some reason at a good price swap over to 24 spline, ratio's the same?

Diffs are 3.54,

How many do you want. have a few spares at home.

If you can get a set of 24 splines and axles will be worth it just.

Michael.

Just the rear set. The problem at the moment is a whine above 50km/h. Debating weather it's worth it getting the new set straight up, to avoid any potential problems.