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Repeat..don't forget to repack
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Actually, the clamshell setup is a left over from the old style "ring" universal joints - which need, no, REQUIRE grease in the clamshell.
If you've upgraded to the Dana-Spicer later type U Joint then grease is not required in the clamshells as the U-joint needle bearings are all sealed and pre-greased for the life of the car. These same U-joints probably are currently used under your modern day car WITHOUT any protection - the seals being enough.
I still put a dollop of grease in the clamshells - it keeps things from rusting up and keeps the "spherical joint" limber and flexible.
Joe K