X gear diff grease

[Gavin Collingwood]

I'm having diff troubles at the moment, I've recently put new diff plates/thrust plates and ceramic balls throughout. But ever since I ran out of the x gear diff lube that came with the kit and started using AE diff lube, not only have I lost the ability to loosen the diff as much without it barking but (and this is the main problem) after only a few runs/ 1 meeting the diff goes crunchy. This has only happened since I've stopped using the x gear lube. The main problem is I'm really struggling to find anyone who actually sells it???
Can anybody help?
Gav