I know it's been talked to death about transmissions and diffs but I still don't get it. Here's my problem, while out on the trails I went to turn around (hard packed snow very slippery) anyways while backing up a slight upgrade I found my rear wheels slipping and I looked at my front wheel driver side and it wasn't spinning. I wasn't able to back up anymore. Seemed that the wheel had traction but wouldn't turn...i tried 4low...nothing..tried locking the Centre diff, still nothing. What's up with that. Kinda embarrassing to be brought to a halt like that.. Can anyone help explain why,is something not working properly..once again sorry for opening old wounds and thanks for the patients.