checked one out in the middle of a field for a guy a few years back with a similar problem. Took a little looking and searching, and finally found a tooth that had broken off a gear wedged in another (reverse idler if I remember correctly). He could not tow home or load it without dragging the rear wheels. I manged to use a long screwdriver, and push the piece out of the gear and he was able to get it home to work on it. One of the more unusual repairs I have ever made on a call while working for the telephone company.