I'm not sure but I seem recall it just being loose in a copple of cases but get it fixed before really bad things happen. Moparts on line if that's the name has Chrysler parts at good prices. You may want to check out one of GDE's tune for the EGR and a better running machine and muchly improved fuel mileage. Look into a Provent. Some have eliminated the 55 gallon drum muffler along with the restriction where it connectes to the cat and noticed a difference. The air filter is from a gasoline KJ and needs changed at every oil change. Adding a an intank lift pump for a dodge/cummins keeps air out of the fuel and most of the wiring, fuse relay and control circuit are already there. The OEEM torque converter is sub par for the engine so Chrysler neutered our engines. GDE has two tunes that gets it back but for the "hot" one you need a improved torque converter. There is already one available for our CRD's from Chrysler and are around $250 online. Clean youe MAP sensor (manifold absolute Sensor)
There's lots of posts here on these subjects.
Don't leave the copper washer off the oil drain plug or you'll strip the oil pan
Most here have the Fomoto drain valve.