I've got a bad U joint at the axle end of my driveshaft. I have a 2wd so the factory U joints are sealed. From what I've seen, many of the replacement joints have zerks on them. Some places sell the sealed joints too, but I figured I'd go with greasable ones. Most of the greasable ones have zerks on the spider. I've only found one or two that has the zerk on one of the end caps.
Assuming I replace them with the type that has the zerk on the cross like shown below, is there a rule of thumb as to which way to position the spider in relation to the driveshaft? Does the zerk face the driveshaft or the yoke? Am I going to need to have the driveshaft rebalanced after doing this? I plan on replacing all 3 joints at the same time so I don't have to do this again in a few months.