THIS WILL CURE MOST WITH STICKING IN ONLY TWO GEARS BUT IF NOT MAYBE DAMAGE INSIDE THE GEARBOX
Ford Transit MK6 only selects two gears probably just a tinny bit of grit down the side of the shaft of the linkage on the top of the gear box.
The reason you can only get forward and backward action on the gear stick is because there is a heavy counter weight on this linkage to assist smooth action between gears which forces the grit to cut into the shaft however the linkage on the other cable is flimsy and cannot force the up and down movement of the shaft . Pull shaft up as far as possible and clean around the shaft then big dollop of grease and gently tap the top of the shaft down then pull up several times, if its grit it will crush and free up also most rust flakes will do the same. Metal swarf may be harder to clear a so stripping the linkage may be necessary.
I gave mine a gentle tap with a 4 pound lump hammer on the top of the linkage, once the grease gets down there the grit will probably turn to dust/paste. The up and down action by hand should be just as smooth as forward back action when moving the counterweight. (very smooth)
This can all be done without disconnecting anything. THIS IS THE SAME ACTION WHICH CAUSED MANY ASSAULT RIFLES TO JAM JUST A SPEC OF GRIT GOES DOWN THE SIDE OF THE CARTRIDGE CASE AND THE EXPLOSION CAUSES THE GUN TO LOCK UP EXCEPT FOR WEAPONS LIKE AK47 WITH TAPERED CARTRIDGES
BILLYBOB9
July 2013