[Bob In Ct]

It's the tires. They are not dimensionally and/or dynamically round. This problem has been discussed at length on this forum. Does the steering column have a rag joint?

Many Cobra owners have the same problem. Big tires, light car, no rag joint, imperfect tires = lots of steering wheel shake around 60MPH. It's not balance. Try having the tires trued.

Bob