Re: Driveline vibration
I had a very similar problem before I tore my truck down for restification. Mine was RPM-related, as it seems yours is (since changing gear ratios affected the speed that you experience the vibration).
I found 2 broken exhaust valve springs - one on each cylinder head. I don't have my truck back together yet, so I'm not absolutely positive that the springs caused the vibration, but that's a likely candidate to me.
If you have a tach, see if you feel the vibration at the same RPM while in park/neutral.
HomerJ
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67 C-10 LWB "Cow-butt-spotted" (neighbor's term) - work in progress. 350/TH400/3.73
67 Chevelle SS Clone 454/TH400/3.73
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