Mopar ATF+4, 42,000 plowing, towing, beating the crap out of it miles. Waiting for it to grenade so I can get a goerend trans... ... ... ... ? Dodge really figured it out with the 48re, no matter what anyone says. So far it has beaten the crap out of dad's 4r100 and brother in laws Allison (both rebuilt before factory warranty expired). I'll take the super expensive Mopar stuff, it's still cheaper than a transmission.