So my block mounts on the chassis are threaded, where the rear mount bolts up to. Can I tap these out to M10? It is a pretty enclosed space so I can't really see much thats going on. CHeers

Ive seen the the welded nuts com loose inside the mount, so make sure you drill the nut out with a sharp drill of correct size and use a sharp tap.

I'm sure that will work, just take it easy when you do it.

I once done the same .. I just pulled the mounts off and got the nuts off and welded new nuts in cheap easy fix

ahhh so its a welded in nut. i'm going to try tapping it first, hopefully m10 isn't too big inside diameter

I once cut out the captive nut in the chassis rail for the sway bar... it wasn't a basic nut but a large square block of metal, assuming they are the same in the gearbox mount cups, taping them out will be fine there will be heaps of meat/strength in them still

great. thanks