I have a 2000 bessacarr 795 on a Ducato 2.8idtd had fifth gear replaced about 20000 miles ago all has been fine noticed this trip when taking foot of throttle and back on again in 5th the lever jumps a little have not had this till this trip all other gears ok it is not jumping out of gear wondered or hoped it might be gear linkage rather than gear any ideas. love the van had great travels over last 40,000 miles any idea`s