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As some of you know, I’ve only had this car a couple of months and I finally got the engine to run decent, but now I’ve got a rather bad vibration in the rear. You can really feel it under moderate to hard acceleration. Cruising down the highway at 65 you’re just barely aware of it.
Anybody got any ideas of what it could be?
Have you checked common stuff like u-joints? Look around the drive shaft to see if anything is bumping against anything. Check the exhaust lines to see if there's any looseness or hitting anything. Could be in the rear. You'll have to do a little detective work.
U joints were the first to come to mind and I’m going to replace them. What in the rear end could be causing the vibration, or do you mean in the rear of the car?
Do yourself a favor and take your drive shaft to a driveline shop. Have them install the new joints, and then balance the drive shaft. Many people overlook the balancing and just pound in some new joints.
If the vibration is still there, I would pull all 4 tires and have them balanced and checked for runout. A defective tire can cause issues as well.
If the problem is still there, look at wheel bearings.
Could be any of the above. Find a good mechanic, put the car on a hoist, jack it up and have an experienced tech look over everything in the rear running and not running. A lot of moving parts on the C2 rear area. Don't guess; otherwise, you will be chasing your tail.
Diagnosis at our shop runs around $100 p/hr. A good tech can find your problem, I would think, in half that time. It is money well spent.
Could be any of the above. Find a good mechanic, put the car on a hoist, jack it up and have an experienced tech look over everything in the rear running and not running. A lot of moving parts on the C2 rear area. Don't guess; otherwise, you will be chasing your tail.
Diagnosis at our shop runs around $100 p/hr. A good tech can find your problem, I would think, in half that time. It is money well spent.
My '62 had a bad vibration and it turned out to be a right rear axle bearing. My '67 had a vibration above about 47 miles per hour and it was a driveshaft u-joint (the front one, the one on the yoke into the transmission).
Sorry, I didn’t specify the 65. No, no knock-off’s, here’s a pic. Don’t know if this has anything to do with the vibration, but the suspension has been jacked up for the body to clear the wide wheels.
First thing I would do is get the rear back down to its normal hight, having those tires sticking out of the wheel well scares me, tires are too wide or the back spacing on the wheels is wrong. This could very well be your problem.
Well, I was going to get into the rear suspension later, but this might be as good a time as any. I just didn’t want to confuse the issue because I can’t see how this could be causing a vibration.
Altering the suspension wouldn’t be my first choice but I do kinda like the stance, even though it rides rough. I’m going to go back stock later unless you guys really think this may be contributing to the vibration.
Here’s what I know, the Torq-Thrust wheels are wider and the tire size is 255/60R-15. The traverse rear spring came from John R. Spring Service, part # 21-307-219B.
This is really bad and, IMHO, needs attention now.
The tip of the spring travels in a different arc than the end of the trailing arm. One of the purposes of the long bolt is to allow both to travel freely. With the spring near-solidly bolted to the trailing arm, the suspension will bind up.
Even a slight weight shift or tire bounce is going to allow the trailing arm to hit the top of the spring. It's bolted to the rear axle, so you'll sure feel it, or worse break something. The weight of the rear is supposed to "hang" on the nuts on those long bolts with room for travel.
Last edited by 65GGvert; Oct 11, 2017 at 08:52 AM.
Bad Vibration
