Quote:
Originally Posted by TheSaturnV
While you're looking in there, have a close gander at the coupling that the spirol pin engages. Over time the pin wears out a groove in the coupling, creating enough gap to allow the pin to slap forward and back. This is typically what breaks the pin. Warrants a weld job or replacement of the coupling.
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Also check out the complete drive shaft, rag joints, look for wear at the ends where the shaft sits in the ball socket. Matt G knows more about this style drive line than I do so you may want to check with him.