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I have a 1984 corvette feels like when driving down road
at like 55 you let off gas car seams to sway left or right not sure
give it little pedal and sways other way
any ideas just put new tires on back
St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16
Also check to see if the bolts at the upper front and rear of your C beam are tight. They are a bitch to get to though. Probably rear suspension though.
Here is a frame pic so you can see how the C beam is attached.