Took my older Craftsman Rider out for the spring ran pretty good and then I starting to go up and down a slope and it would kind of just sit there after a while the wheels would not spin Engine ran OK but would not move once I got on level surface it was much better I'm just kind of thinking out loud but could this possibly be the drive I bought this a year ago and have no idea the last time it was changed Any help would be appreciated Thanks so much