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2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
You may have a drive shaft out of balance or the center support for the driveshaft could be bad, the manuals had a two piece driveshaft. Im not saying its not the transmission but usually if something internal goes to cause a vibration, youre going to hear some NOISE.
That's one thing I forget to mention, do your Rams have 2 piece driveshafts? If so, this sounds a lot like the carrier bearing...