what, like greasing..... just like your supose to do to a U-joint.
how big of lift, etc are you running? I'm around 7" and my axle was setup for a cv but running a reg shaft, so when i did the sye and 2 low i went for a cv to try smoothing out the ride. if you get curiouse about your angles, checkout this page.
http://www.pirate4x4.com/tech/billavist ... ndex2.html