I have at last replaced both the bottom balljoints, and fitted some drive shafts to the ZS, i found the outer cv joints to be identical to ZS 180 ones, including the abs reluctor rings, so i swapped the outers over anyway on the basis the ZS ones where new.
The one issue i did have is that the inner boot on the passanger side split as i tried to fit the hub... i was not impressed... but i simply fitted an outer boot to the inner shaft, it fitted and retains its grease so it will be fine.
Pic of one driveshaft fitted.
I then filled the gearbox with mtf94, i now have a car the can be moved under its own power at last ! i took this picture after driving it to the end of the drive lol.
So my list is now getting shorter.
I need to swap the Pas pumps, and fit the seats to put the SRS warning lamp on the dash.
The main issue i have now is with the ABS... the light is on, when you put the ignition on it comes on and stays on... now i dont know if all the sensors are ok at the minute, but i was waiting untill i had driveshafts in etc before posting up about it.
So currently it has ZS 180 wheel speed sensors all around, the outer cvs are the same (even by part number) to the 420 ones so i doubt they are the issue.
The other thing (which could be the issue) is that im still using the ZS 180 modulator on the 420 loom ?
If anyone can shed some light on this i would be very greatfull.