If you run grease joints make certain that the web with the joint is in compression, not being pulled away

I'm using Spicer U-joints...Aren't they pretty good?

denny's drive shaft made a shaft for me & said to run solid joints. greaseable joints are rifel drilled thus are weaker. makes sense don't it. i did break a greaseable joint once. that was enough for me. stay safe, seeya.

"Which end did the cap come off on? I had a cup come out on the pinion shaft joint on the starting line It ended up that I had spread the new Spicer forged steel rear pinion yoke apart It didn't look like anything was wrong to start with, once I tried to install a new U joint I found that one cup on the pinion yoke a tiny bit loose Just enough to let the interior keeper pop off"

Front u-joint right behind the trans is the one that lost a cap. I'm guessing the keeper snaped off when I got out of the throttle and that's when it all started coming apart.