I've seen some lifted trucks that had the rear axle turned so the yoke was pointed several degrees upward toward the driveshaft.
Some people say that's bad, others say it's just fine. I can't see how the orientation of the axle would change anything in terms of axle longevity. If the gears are turning and you haven't run it out of lubricants it wouldn't seem to make any difference at all. I know one guy who is just dead set against having the diff anything but level.
Will turning the yoke skyward reduce the axle's longevity?