Cowl Shake on '67 Convertible

could be an unbalanced drive shaft or a wheel that's out of balance.

i'd get your tires balanced first as that's pretty cheap. also look underneath the car and look at the drive shaft to see if it has a dent or something that stands out.



on my '66, i had my rear drum shoes adjusted just a tiny bit too tight, which caused it to shake at around 50-60mph

Hi jcp123
vibrations often occur in phases it may very well be vibrating at a lower speed but at such a low amplitutde you can't feel it.
watch for balance weights on your driveshaft...I've seen them fall off as the driveshaft ages..they're only tack welded on...starting by balancing wheel/tires would be cheapest but if you have lost a driveshaft weight you can use an old mechanics trick...mark your driveshaft tube in to four equal sections around the tube where the weight is missing...number them 1 to 4 place two hose clamps with the screw drives on each of the marks one at a time (the screws act as weights)road test the car with the hose clamp screw at each postion (1 to 4).when you notice the vibration improve or go away move the clamps around that number mark until its the best it can get...It's a lot of trial and error but it does work..if you find this works than you can spend the $$$ to have the driveshaft rebalanced if you don't like having hoses clamps on your driveshaft...I've seen these clamps (stainless steel ones)on driveshafts last years........or make friends with a mechanic at a ford dealership and get them to drive with you and your car with the electronic vibration analizer it'll tell you right away whats shaking hope this helps you out