Sounds like your oneway bearing on your third gear has manfunctioned. the fact that it will run fine in reverse but not forward, But I would have to take down my tranny to be sure. The manual is not clear to the path of power in reverse. I will pull out my tranny in the next day or two to check it out and see what I find out for you!!! I wish I was more sure without pulling the tranny but, I need to know, now. Besides everything else thats works in reverse would work in reverse, and I have an old oneway I can test my theory. Give me acouple days and I will have your answer for sure. at the very latest by monday..