This is somewhat of an up date from my thread here:
Rear adjustable arms are on!
When I installed the Ingalls arms I drilled one with a grease fitting and I left one alone stock to see if a greaseable ball joint would last longer. Sure enough on my suspension check last month the side that DOES NOT have the fitting is worn/loose. I checked it this month and it may have worn some more even. The side that has the fitting is rolling along ok nice and tight.