Okay, I finally got a chance to check out the drive shaft. Tach isn't working, but I figure the rpms have to raise at least 1000 before it starts turning. Looks like flex disks to me, or would it not turn at all if it was those?

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79 300SD - $50 out of pocket purchase
03 Dodge Ram 3500 CTD
2003 VW Jetta TDI