ours started slipping and clunking months ago mainly cold first trip of the day 3-4 slips badly at slow take off cold.
last week put it in reverse backed up like 20 ft stopped for a second then went to backup again it just sat there with transmission slipping away never moved for 30 seconds i put it park back to reverse and it finally moved again.and of course dealer cannot feel it replicate it or hear the rear end clunk like hell either real convenient