So I guys as I mentioned before in my itorduction “I am an addict” can’t stop buying stuff. The story: I have been upgrading my 530 4wd with everything available for no reason at all. Recently I saw a video with a guy using a locked diff and decided I wanted to try it. I searched the forums for info and did not find what I was looking for. So today I went ahead and pulled the trigger on this Viscous Locking Differential Set - fg08604 only to later read on another suppliers website that is not suitable for 4wd. So now I am confused. Can or can it not be used and why is in not suitable for 4wd? This may be my first actual post so fingered crossed. Cheers.