update on the chain drive drop box
well it broke
not actually sure if the chain broke jamming the sprocket on the diff which caused the drive shaft to snap and the resultant suspension failure
or
the drive shaft broke up causing suspension failure, jamming on the rear upright and snapping the chain
anyway if you want a laugh this is what it looked like:
https://www.youtube.com/watch?v=EUbqT1tZqXY
Richard