hi there everyone i have just got a second hand vauxhall victor floor mounted 4speed gearbox which i have manged to fit the bedford ca dormobile 3 speed gearbox linage and the gearbox mount , so i can use the coloum linkaged , what i would like to know do i have change anything else i.e is the 4 speed box gear linkaged (coloum) any different then the three speed box ( which i have fitted to my dormobile) or is it a straight swap thanks mark ps the pop shaft will fit aswell ok (splines are the same)