In Reply to: Buford posted by Jim on February 23, 2018 at 20:26:07:
The detent plungers (also referred to as balls) are accessed from the outside of the transmission housing. I sold my 860, so canít remember which side. Look for three flathead screws, vertically aligned. The plunger, spring and seal are available from New Holland. Third gear and Reverse detents are typically worn flat on one side. You could try swaping with another gear to troubleshoot the issue. Change all three components if they are the problem. Good luck.