On the universal end of the yoke is a plug like a freeze plug! it plugs the hole (the end) after machining the spline grooves! that plug can leak and is easily replaced. Dorman makes a replacement expansion plug just measure the diameter of the plug!
You have to pull the yolk and universal and put a drift pin ( punch) down the yolk and knock out the plug when replacing the plug, a little sealer on the edge will help seal it!
Last edited by painted jester; 02-18-2013 at 02:54 PM.