has anyone had problems with a 722-5 transmission burning up the rear planetarys.have disassembled cleaned replaced all lips seals,clutches ,bearings,and rear planetary,sun gear and sprag and it is still cooking the bearings around the rear planets after 400 miles.could it be the trans cooler causing this or other???

Sorry I took so long to post the fix,but the cooler was the problem. Replaced radiator & added an external cooler to that car and all has been good for 9 years now.
Howard