Forgive my total ignorance on this subject. I am heading out with a local 4x4 club in two weeks on a long weekend camping trip to an area that is very remote. According to the guy organizing the trip, I should have “replacement u-joints” on board if I want to come along. I will hopefully have installed my CDL switch by then but, apparently, this is not good enough. What parts do I need to be able to fix the u-joints if I get a problem? P/Ns would be especially welcome.