Is it speed related, or RPM related? If speed, it"s probably something in the drivetrain. If RPM, it"s probably something in the engine. If you have a 400 ci chevy engine with a 350 counterbalance, that can cause an RPM related vibration, because 400s are externally balanced, whereas the 350s are internally balanced. Also, I think, but am not sure, that the 400"s auto flexplate is different from the 350"s. Of course, the inverse of these two are true also. If it"s speed related, it could be a bad uni joint, wheel bearing (not likely), unbalanced or bent driveshaft, or something I had when I swapped a 400 Chevy into my "72 Vega wagon: It would vibrate like hell when I was going about 25 mph, then disappear. Drove me nuts, until I took the driveshaft/universal joints apart, and rotated the driveshaft a quarter turn. Vibration disappeared. It seemed to want the rear uni on a different rotational location from the front one. Whatever, we need to know if it"s speed related or engine RPM related. BTW: The Vega ran like hell. Gary
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