Yikes!! Then install a bolt in overrunning clutch, install a Sonnax l/r servo piston and he should be good for off-roading. If he is going to tow near or past the GVWR then consider adding a 5th disc to the front clutch, install a cast aluminum or billet accumulator piston, and add a good cooler. The converter is usually ok but we had issues from time to time with the stator overrunning clutch failing some times. If it does the best converter out there for the money is the Mopar Reman 12.2" diesel converter -'it has an improved stator ORC that has had no failures since we went to that design several years ago. Plus now they have the high dollar Sonnax front cover on theM. Tell your son to keep the shiny side up on the Jeep (and the truck).