Hi, after I ran GST into a concrete block, I broke the lower suspension arm and
while I waited for new part to arrive, ran the car with weak suspension arm consequently
I ended up with a cracked differential outdriver ( part DS029 ) coming out of the front gear box.

I took apart the cover from the front gear box and was presented with the front differential.
The outdrivers on either side of this are attached via a plate held on with four little
hex bolts. Problem is as soon as I tried to undo these bolts, I, as we say in Ireland
'wrung' the head of each I tried to undo. Tut tut soft metal[]

Now I cannot disassemble the gear and remove the diff cup.
Has anyone encountered this problem and if so what's the remedy. I'm thinking I'll
have to get a whole new gear box just to replace one diff cup! Thanks.