Couple of coments:
-I doubt any of you will ever need to rebuild a set of Dynatrac's
-There are no Moog ball joints available for the JK, they list a problem solver lower ball joint for the JK, but it is an adjustable one to correct castor/camber and it's for the TJ, it doesnt even work in a JK
-The only JK ball joints available currently are: Factory Mopar, Dynatrac and Crown. The crowns are not any better and probably worse than the factory mopar, they are really cheap (inexpensive) though. The list price on the Mopar joints are $110 per side
-The new Poly JK ball joints are not what the Dynatrac's are, but are a big step up from factory Mopar ball joints, at a fraction of the price of Dynatrac, but just a little more than Mopar. They will provide you with years of service, not months like the Mopar ones.
Those of you that think you know everything really annoy those of us that do!