Gear selector mechanism

A gearbox having an output shaft and an axis parallel to said output shaft, said gearbox comprising a main housing for enclosing gears and a bell housing for positioning adjacent an associated clutch, said bell housing secured to said main housing,

• first roller mounting means located in said main housing, second roller mounting means located in said bell housing, a first set of rollers mounted on said first roller mounting means, a second set of rollers mounted on said second roller mounting means,
• a plurality of shift bars operatively connected to shift elements for engaging and disengaging said gears, each of said shift bars extending parallel to said axis, each of said shift bars having a rectangular cross-section and having first and second axially spaced ends, said first ends of each of said shift bars mounted on said first set of rollers, said second ends of each of said shift bars mounted on said second set of rollers, at least one of said first and second ends of each of said shift bars defining a slot to facilitate the assembly of said gearbox, said bars being constrained to substantially axial movement by said first and second sets of rollers,
• and control means for selectively engaging and axially moving shift bars.