Looking for some help. I have a 69 Camaro. Rides great except when I hit 52-55 mph range. At that point car begins to vibrate and shake. Car rides great both below and above that range. Had new front tires put on and balanced but that didn't solve the problem. Anyone ever had a problem like this? Any suggestions?

 

Where do you feel the viration? Through the steering wheel or the seat?

 

That is commonly a tire balance issue. If your not going to change the rears at least have them balanced.