Righto.
There was a couple things that corrected the driveshaft issue. First being the engine mounts. Is you engine and gearbox mounting on the chassis the same as mine?
Old Engine mount on chassis. And you need to brace this mount to the suspension leg or something, to stop engine movement under load.
Gearbox mount on chassis.
If so, you will need the revised mounts from Marlin. I will confirm that the mounts in these pictures are the revised ones.
The engine and gearbox actually sits off line:
Talking of engine/gearbox bits, this was supplied to mount between gearbox and rear lower chassis member:
When car was stripped, this was bent like a banana. Possibly due to engine not being braced at the front, I don't know.
As for driveshafts. I'm about 95% certain that these were 420 diesel driveshafts after the 800 long one were too long. But I would ask them to measure them. The long one, I ended up going to the scrap yard where there were a lot of driveshafts sitting there. And went measuring!
Mine are/were
:
Short = 567mm
Long = 973mm.