Join Date: Dec 1999
Location: Winston Salem, NC
I've seen some posts on here lately about vibrations, so I thought I'd post a question about my vibration. I've had my car for about 5 years now, and it has always had a vibration to it. Here's what happens: At about 50 mph, I start getting a light pulsating vibration that seems to run through the car in waves. The car will vibrate for about a second or two then quit, then vibrate then quit, etc. It's not so bad at about 50 miles per hour and I've gotten used to it, but it still bugs me. It's very hard to tell where it comes from since the entire car shakes and it goes through it in a wave-like progression. As I speed up to about 70, it gets more intense and the delay between vibrations decreases. When I hit 70 or so, it pretty much goes away. If I speed up to about 75 the vibration comes back very strong, pulsating very quickly and generally shaking the entire car. The vibration does not change based on throttle at about 45-50 mph. The frequency of the vibration at highway speed seems to change somewhat with the amount of gas I give it, and if I put it in neutral, the vibration changes from a pulsating wave-like vibration to a general shaking, and if I shut the engine off, it's still there. Also, all wheels appear to be keeping an even contact with the road at highway speeds...one of them is not jumping up and down.
Here's what I've replaced:
Front coil springs, front bushings, front tie rods, upper ball joints, (other ball joints seemed fine when I replaced the front springs), idler arm (twice), rear leaf spring bushings and shackle bushings, new shocks all around, new tires all around (twice) with multiple balancing and rebalancing, several alignments, front U-joint (I did not replace the rear ujoint, it seemed fine), subframe bushings with polyurethane. I've gotten alignments after each thing I have done on the suspension.
When I got the car, the front suspension was a mess....bad idler arm, one coil spring was experiencing coil bind on one side, upper ball joints in pretty bad shape. After doing all the front end work, the car still vibrates in the exact same way.
The car is silky smooth and absolutely vibration-free until about 45-50 mph.
Any ideas here? Is it the driveshaft since the frequency changes based on load? Should I get it balanced (haven't had this done since I can't find a place around here that does it)? There don't appear to be any missing weights from the driveshaft. I have not replaced the rear wheel bearings...could it be these or worn rear axles? Sorry for the long post, but I hope someone can help me out....I'm tired of it and want it fixed!!! Everyone loves to look at my car, but when I take them for a ride on the interstate, they wonder what is wrong with it.
-1967 Camaro SS350
[This message has been edited by jrt67ss350 (edited 03-27-2001).]