Shaking
Thread Starter
Burning Brakes
Joined: Oct 2012
Posts: 961
Likes: 118
From: Panama City, Florida
Shaking
Just purchased a 75 and the test drive was with 15 year old (or older) tires but the test drive was good. First thing I did was get new tires. The store owner showed me that two rims were had a slight wobble. And since then after about 30 mph it shakes, wobbles, (not sure what the proper word is. He put both of those rims on the passenger side. I purchased a new rim and today he replaced the front one with basically no change (maybe just a bit). I guess I'll get another new rim and replace the rear one. If that's not it do any of you know what else would cause something like that?
Thanks!!
Thanks!!
Thread Starter
Burning Brakes
Joined: Oct 2012
Posts: 961
Likes: 118
From: Panama City, Florida
The trailing arm bushing went out a couple days after I purchased the car. (they were original). So, they are new assuming the shop did it right. I'll check out the strut rod bushings.
Race Director
Joined: Nov 2006
Posts: 13,248
Likes: 7,840
From: Sunshine Coast, Queensland, Australia
2025 C3 of the Year Finalist - Modified
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Cruise-In VIII Veteran
There are so many things that can cause a shake/wobble.
I rebuilt absolutely everything under my car chasing a shake that came on right on 70MPH. Drove me insane.
Finally found twisted yokes on rear half shafts. Nothing you could see mind you.
Best of luck to you.
I rebuilt absolutely everything under my car chasing a shake that came on right on 70MPH. Drove me insane.
Finally found twisted yokes on rear half shafts. Nothing you could see mind you.
Best of luck to you.
1967 Pedal Car Champion
Joined: Mar 2020
Posts: 9,137
Likes: 4,248
From: US-PNW
First, swap the new front wheel with the old rear. If it's due to a warped/bent/wonky wheel you should definitely feel it in the steering wheel feedback.
Do you recall if the car shook for the few days before the rear bushing changes?
I'd check that all rear suspension bolts are tight, both trailing arms are packed with alignment shims on both sides of the bushings, and the shock mounts are tight. Do the same checks for the front a-ams and alignment shims.
Do you recall if the car shook for the few days before the rear bushing changes?
I'd check that all rear suspension bolts are tight, both trailing arms are packed with alignment shims on both sides of the bushings, and the shock mounts are tight. Do the same checks for the front a-ams and alignment shims.
Pro
Joined: May 2019
Posts: 560
Likes: 261
From: Fountain Hills (Phoenix) AZ
What brand of tires did you get?
When I bought my '75 coupe last year, the previous owner had installed new "phantom" brand tires. After several attempts to balance, the local tire shop checked the wheels for true (they were perfect) then the tires (they were 1/16" out of round). A new set of BFG's fixed the problem.... smooth as glass.
Cheap junky tires.
When I bought my '75 coupe last year, the previous owner had installed new "phantom" brand tires. After several attempts to balance, the local tire shop checked the wheels for true (they were perfect) then the tires (they were 1/16" out of round). A new set of BFG's fixed the problem.... smooth as glass.
Cheap junky tires.
Thread Starter
Burning Brakes
Joined: Oct 2012
Posts: 961
Likes: 118
From: Panama City, Florida
First, swap the new front wheel with the old rear. If it's due to a warped/bent/wonky wheel you should definitely feel it in the steering wheel feedback.
Do you recall if the car shook for the few days before the rear bushing changes?
I'd check that all rear suspension bolts are tight, both trailing arms are packed with alignment shims on both sides of the bushings, and the shock mounts are tight. Do the same checks for the front a-ams and alignment shims.
Do you recall if the car shook for the few days before the rear bushing changes?
I'd check that all rear suspension bolts are tight, both trailing arms are packed with alignment shims on both sides of the bushings, and the shock mounts are tight. Do the same checks for the front a-ams and alignment shims.
Thread Starter
Burning Brakes
Joined: Oct 2012
Posts: 961
Likes: 118
From: Panama City, Florida
What brand of tires did you get?
When I bought my '75 coupe last year, the previous owner had installed new "phantom" brand tires. After several attempts to balance, the local tire shop checked the wheels for true (they were perfect) then the tires (they were 1/16" out of round). A new set of BFG's fixed the problem.... smooth as glass.
Cheap junky tires.
When I bought my '75 coupe last year, the previous owner had installed new "phantom" brand tires. After several attempts to balance, the local tire shop checked the wheels for true (they were perfect) then the tires (they were 1/16" out of round). A new set of BFG's fixed the problem.... smooth as glass.
Cheap junky tires.
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Thread Starter
Burning Brakes
Joined: Oct 2012
Posts: 961
Likes: 118
From: Panama City, Florida
Race Director
Joined: Apr 2000
Posts: 17,676
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From: Who says "Nothing is impossible" ? I've been doing nothing for years.
The most unsafe ( and I am guilty of it myself) is buying a C3 and taking it out for shakedown ride with your foot to the floor to see what it can do, this is dangerous and should be a "Sticky". The car should be towed to your mechanic and checked over first, after all you have no idea if something is rotting under a 40+ year car.