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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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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