The why and how is not important. The point is, you just busted your axleshaft U-joint and you’ve got to replace it. If you’re out on the trail, there are a couple of things you can bring along that’ll make the task much easier. If you’re in your garage, so much the better. To show you a couple of tips, we grabbed a set of roached full-size Dana 44 shafts from a beater and a brand-new set of G2 chromoly alloy axleshafts that are slated to go into a high-horsepower YJ project. Normally the PN 98-2031-002 shaft setup for Dana 30 axles come completely assembled, but we special-ordered an unassembled kit so we could run down some U-joint installation highlights.