Don't know about that. I think though that the standard T25 4 speed change is pretty good. I re-drove a T2 the other day, and that really is a revelation about not really knowing where the gears are, or even the box! My T25 feels very precise in comparison.
Its simple enough
It bolts on top, inside the van I cant remember, I think that you may have to drop the spare wheel down so that you can get the bolt extensions on
Anyway its not hard but it is advisable whilst you are doing it to give it all a real good clean and lube and possible paint the steel box up.
TTFN Kris
Its not broke? fiddle with it until it is, then you can fix it
Oh and the name is pronounced CRISIS
CS/JK/CS 1.6 diesel on a DY/DY/DU 4 speed box (3rd engine & gearbox now fitted)
07704 771 285
aka Mr Cortisone