Has anyone else had any Transmission problems out of these. Mine is popping in and out of 3rd and 4th under load. But it shifts in to the grear just fine. I busted it down to the cases and one of my shift forks is eat up. I don't understand the grears don't look rounded enough to push out of gear. But then again I am used to working on cars. is there something I am missing. could it be the shifting mech. or the shifting drum, or the forks in a bind?? A friend of mine said the problem came from landing on the shifter, off a jump.