I have 1977 lincoln versailles with a vibration problem no shop can find. Feels like the tires are out of balance, but they are not. It has stock aluminum rims. However it has heavy case wheel coves 2-3 lbs held in place with three screw that are not evenly spaced. It occured to me that these could be the problem. The wheels are balanced with out them on but with them in place they become out of balance. I'm thinking for proper balancing the cover need to be in place or at the very lest the screws.
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