GIDDAY AM HAVING PROBS WITH MY 120/45 4WD TRACTOR CRYSTAL I THINK GEAR STICK JUMPS OUT OF GEAR MAINLY HIGH RANGE ALTHOUGH HAS JUMPED OUT OF REV COUPLE OF TIMES SEEMS TO HAPPEN DOWN HILL OR SLOPE WHEN I BACK OFF READ SOMEWHERE IT COULD BE A LOOSE K NUT? OR DETENT PROB LOW RANGE SEEMS TO LOAD UP WHEN GOING UP HILLS GEARSTICK MOVES BACKWARDS BUT DOESNT JUMP OUT ANY IDEAS WOULD BE GREAT