ive got a c 85 that i love. i finally got around to putting the deck on it today and aout halfway through my yard, the 8 speed kicked itself out of high range. it has never done this before but i didnt think anything about it. then it did it again, i put it in low and it was good but later it started popping out of low when i was holding the clutch or going down hill. now it is stuck in high range and wont come out. is this a common problem or something more. i have never worked on a tranny before and was wondering if anyone could help me.