[fuddbutter]

I have been doing a lot of searching, can't find this problem anywhere, or any real problems with the diff, so i shall ask..

Been having noises for a long time, been back and forth with Subaru trying to sort it out, they keep telling me its the axle nut, get the usual click click getting on and off the throttle, and reversing and going forward etc.
They have torqued it a lot, i have checked it myself and it's fine.

Anyway, noise has gotten worse.

I recently had some power by max subframe/diff solid riser mounts installed, while it was there my mechanic mentioned that there was a lot of slop in the diff.
over the last few weeks, the noise has moved up to a ticking sound, usually fine when the diff is cold, but when it warms up it gets louder (almost embarrassing to drive!)
First i thought it was an exhaust leak, had that sound to it, but it was speed dependant (not engine revs)
Also couldn't go over 80kph (50mph? I am an Aussie) without the back end vibrating heaps, which is even more evident with the solid mounts.

I have been back to Subaru, who said the diff is cactus, but don't want to replace it due to the solid mounts saying that was the cause (even though i have email records with them saying the diff issues were there prior to the mounts being installed.)

I have to wait till Monday to talk to the service manager who is off on holidays, I reckon I will have a good case to get it replaced, my suspension guy is a good mate of his, and one of the best in the country, and the mechanic works for him now and then and he does all his race cars.

But I am trying to work out what the tick tick tick noise could be? As i said, it happens when the diff gets hot, once its cooled down it goes away.

Also, I should mention, this has been going on for 2.5 years now.
I lowered the car a while ago, coilovers, PBM LCA's, Hardrace toe arms, then the diff risers cause the car is so low.
All so I wouldn't have any axle issues..