I don't know. I have a friend in the transmission repair/rebuild business and he says he can make a RFE into a very durable unit, and he claims he's never had one come back. Then again, he refuses to build for racing, says guys will still find a way to blow them up.
Question: wouldn't be easier to upgrade to a 66RFE if one was seeking a stronger unit without expensive durability upgrades?
Regards,
Dusty
2019 Ram 1500 Billet Silver Laramie Quad Cab 2WD, 5.7 Hemi, 8HP75, 3.21 axle, 33-gallon fuel tank, 18” wheels. Build Date: 3 June 2018. Now at 106033 miles.