I recently replaced 5th gear in my AX 5 and now its locked in reverse. I went into the switch housing and used a screwdriver to disengage reverse and now I have 1-4 gears. do not have 5th gear however and if I put it in reverse, it stays in reverse and I have to go back down to the switch housing and disengage it again. what did I do wrong when I installed 5th gear? pics/videos to explain. also put a lock collar on the output shaft to keep 5th gear snap ring from coming out.