[Josh]

I put the new GM shafts in mine, so far haven't had any problems with em. They're made different and have a inner Teflon like plastic lining to alleviate the clunking sound felt/heard in the wheel. I always figured you could just put a grease fitting in em and never have a worry. Never tried it, always just lubed em using the stuff from the gm kit and silicone brake grease or high temp wheel bearing grease...