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The tires could be in balance but still be out or round. balance is static , out of roundness is dynamic ..........or is it the other way around? Jeez, getting too old to figure it out any more lol . anyway try another set of tires on the front before you start throwing parts at it




This is actually what it feels like, out of round tires, but why only between 37 - 41 MPH?? I purchased the front tires out of a persons attic, they did not fit on the front of his Nova....

Rear wheels and tires will not fit up front, too wide.....









because That speed is the "Goldylocks zone" where the harmonic balance of the car and tire match up and then you have a vibration . Much like a drive shaft , lets say you have a very minor bend in the drive shaft , you won't feel the vibes until your in or near "the zone". Get tires and wheels and give it a try .