Veteran Member
Lifetime Gold Member
Aug 22, 2018
St. George, Utah
I have searched a bunch of post but not sure the answer is out there. My car is completely restored. Engine was balanced, new balanced drive shaft, new tires, all balanced. I have a bad vibration that starts at about 50MPH and gets worse as speed increases. I really feel it under my seat. I did not check bellhousing trans alignment or the axles. Only thing left is the wheel lug nut holes. Any ideas?


Staff member
Lifetime Gold Member
Feb 26, 2004
Bloomington, MN
Put the rear on jacks stands and rotate the wheels to see if there’s any wheel wobble or tire tread issues.

Those problems are usually detectable at low speeds so check the driveshaft and U-joints for play/slop. (Rotational or end-to-end at the joints.)


Veteran Member
Lifetime Gold Member
Sep 15, 1999
Ontario, Canada
If you have lots of balance weights on the wheels then I’d get them straightened. I had mine checked and straightened back in ‘85 before I had then sand blasted and they are perfect from 1 to 90+ mph. Also put the tires with the least amount of weights on the front.

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