For a few weeks now my centre diff has been whining so tonight my mechanic friend stripped the gearbox from my car hoping that it was the transfer box bearings that needed replacing but we found that the centre diff would not move by hand. So with your help I need to know what my options are? Source a second hand centre diff and for that do I need a specific diff for a UK 99 turbo? Rebuild the diff? What do you guys think?