I really struggled to get the prop-diff bolts undone on the car I was breaking. In the end I used an angle grinder to thin the nuts down so there was about half a mm of material left and then snapped them off. New nuts needed obviously, but there was no way they were coming undone otherwise.
thanks guys, i cant get the back plate off, where the diff mounts on the car the bolt is solid!!!, managed to get the shafts off tho, thanks for that, i think the angle grinder may come into it
I have soaked everything in wd40, will try angin in an hour!!