Gearbox Clutch CVs - Gearbox type swap

HarryMann: T25s can have their 4 speed boxes swapped for 5-speed and vice versa. Selector rod layouts are the main gotcha.  Diesels are slightly different rear selector rod detail; TD diesels have different front gate boxes (wider cooling tunnel)

yankiecamper: I've changed my old 4 speed diesel box for a 5 speed turbo diesel one ive removed all the four speed linkage and replaced it with the 5 speed linkage but now i cant get it to work its all really stuff and tight can i put a 5 speed box and linkage into my 1981 van or are the chassis different i.e. the holes that it all goes though.

any help would be gratefully received

metalmic8ey: Have you replaced ALL the linkage from g'box up to and including the gear stick and its mounting box?

yankiecamper: Yes I've changed the whole lot from box to gear stick its all just really tight I wondered if there was any diffrences under the vans on later models for the 5 speed selector rods?