This weekend while towing my TH my 47re was acting up. Two times while pulling a long up hill grade it would down shift to third then imediately shift right back into fourth. It would shift back and fourth about three times finally I just feathered the throttle to keep it from shifting and lugged it up and over the top.
Over drive was off and it would shift just fine while starting from a stop and getting up to speed on level ground.
Not sure on what could be going on?