I had this problem over the weekend. The ATV would not go forward, it would go in reverse until it got under strain (backing onto a trailer). Researched it found this page. After reviewing the suggestions, I pulled the drain plug, a lot of water came out. No smells, no metal shavings just dirty water. I let it dry over night. Cranked it, pulled it off the trailer, rode it for a mile easy and then climbed about a 5 - 8% grade with no problems.