256,000 miles on mine. Have not had any problems or updated anything. It has always been used to haul everything from farm animals to campers. Removed the check valve and added the shift kit. Don't haul with the OD turn on and service it. My diesel engine is bone stock. Maybe I'm just lucky? IDK
maybe some of these Cummins people, who are unhappy with their 47re's, have modded their engines(which I understand is quite easy to do) beyond what their oem trans is capable of handling without being modded, too.
