It doesn't sound too abnormal at all. Even the hardtops and coupes flex a little when you jack up one corner. My '67 post coupe (arguably the stiffest body style) flexes some if I jack up one corner. The convertible has to flex more than that! My '69 Corvette convertible flexed to the point you couldn't open the door, yet the car was solid as a rock on the road without a squeak or rattle anywhere.
When the only tool in your toolbox is a hammer, you tend to see every problem as a nail.
Last edited by chuckha62; 10-16-2013 at 11:19 AM.