Running dual top loaders and every now and then the rear case will get stuck in between all of the gears and I can't shift. So I pull the clip and the shifter, use a screwdriver to shift the rails , problem gone. I can use the screw driver to shift the rails around, instal the shifter and it will work fine. Then out of nowhere, I'll be going from 2 to 4 and it gets all jammed up again. I've checked the shifter rails and the shifter end for burs and can't find anything. This is getting frustrating, I've already torn it down once and I couldn't find anything wrong internally, I'm getting sick and tierd of having to pull the boot, the clip, the shifter, then use a screwdriver to shift then put it all back together. PLEASE HELP, anyone got some ideas ?