Did you have any work done on it at the rally?
Any signs of fluid at the CARC refill hole or breather vent?
Any clunking sounds as in the shaft banging around inside the housing...broken Ujoint?
Probably a lot easier to diagnose at home after putting it into a Uhaul truck and driving home...diagnosis hard to do without pulling it apart, would be a shame to spend money on parts not needed only to find something else went south.
At least you had a good rally and ride out! Pity you could not make it to Telluride...very nice riding in that area!