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Message: <blockquote data-quote="GDTrumbo" data-source="post: 954212" data-attributes="member: 10665">At the back of the yolk (u-joint end) there is a plug.  This plug kinda resembles a freeze out plug in an engine block.  You will have to look up between the u-joint and the butt end of the yolk to see it real well.      During the manufacturing of the yolks splines, a pilot hole is bored completely through the yolk and the splines are machined.  The last thing added to complete the part is a plug at the rear.  I had this plug fall out on my '69 Road Runner.  Leaked like a pig!    We just disassembled the front u-joint and welded a round flat piece of 1/16" steel into the small well that the OEM plug fit into and that was it.  Problem solved.  It'll be a little different as your welding aluminum but no real biggie..............GT</blockquote>