I can confirm greasable joints are weaker (hollow) and more roller-fail prone (grease never makes it to most of the needles). U-joints are a tough sell at the dealer level many times when each joint can be over $100 just for parts from GM and O-o-O'Rielly's has them for $17. The OR joints have zerks, the GM's do not (and say Spicer on them).

