8v gearbox is cable clutch on all i believe and gearbox is weak.I would not use an 8v box on a vr myself even if it did fit.Clutch is also smaller and weaker.
True say this. They are VERY weak.
The diff tend to go pop on the dfq's (8v gti boxes)
Mines on 148000 miles and still smooth as silk... 
I blew an 8v box to bits last Autumn, and I mean bits

16v aint much better, nothing to do with the box just the riveted diff VW tended to use.
Killed all types through snatching gears and shearing the rivets off
