Thank you to everyone! I will get the car up on the lift and check out all of your suggestions. I will also take some pictures and measurements in case it will help to determine if my drive shaft and rear axle are original. I just got back from a 100 mile trip and I had my window down in...
I have a 1957 Country Sedan Wagon that has recently developed a high speed pulsating shutter that begins to appear at 45 mph and gets progressively worse as it goes up to 80 mph at which point it begins to lessen in intensity. I can get it to go away momentarily by backing off of the throttle...