Attention: TDR Forum Junkies i also had this in my truck, replaced the rear u joints, pulled the front DS with no diffrence, so i took the rear shaft to a good driveline shop and watched him work on it, he spent about 45 minuites balancing what was a factory balanced shaft, that completely fixed my vibe. as a side note he completely removed the factory weights and used only a couple smaller weights to get the balance
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