Originally Posted by Ohio HD

While you have it apart, inspect the clutch hub splines where the steel discs make contact. There may be worn areas that are causing the steel plates to hang up and not move smoothly. Less likely because it's steel, check the clutch basket splines where the fiber discs ride, there may be some damage, just make sure these areas allow the plates to move freely without binding. Also check the clutch basket bearing, see if it wiggles or is loose, that may also cause engagement problems.