Have a drive train issue I pulled the tractor up to the garage to change the blades on the mower and it started to rain so i pulled it up into the driveway. The next day my wife got on it to mow and it would not go into gear while it was running. This happened before and john deere said to start it in low range coast it into gear and hold the brake untill the clutch disk broke free. this time something broke free now there is no rear dirve but if i put it into 4x4 and the front wheels drive. I pulled the clutch cover and clutches are working any ideas would be great.