Howdy (again)! When I get my '79 LeBaron out on the highway and I get up to 70 mph, I feel a cyclic vibration. The vibration is not constant. It runs in cycles. It would be like running over rumble strips every 200 feet. That's the best way I can describe it. At 65 mph there is no vibration. Since then I have replaced the front wheel bearings and front & rear u-joints but the vibration is still there without change. Any ideas as to what's causing this strange vibration?
