Bad Vibrations - Team Camaro Tech
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post #1 of 7 (permalink) Old Apr 11th, 03, 10:22 PM Thread Starter
 
Join Date: Apr 2003
Location: Blue Springs, MO
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A problem that I had last summer has come back to bite me: going down the road at 60 or higher there is a vibration coming from the back. It seems to shake twice then roll forward. When I had my gear put in the mechanic said it was a bad yoke and replaced it. After that I didn't seem to notice the problem anymore. I have checked the bolts holding the yoke to the carrier and they are fine. Also had the tires balanced which did not help. Someone suggested that the carrier bearing may be bad. I need a list of possible things to check from most likely to least. Thanks.
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post #2 of 7 (permalink) Old Apr 12th, 03, 05:38 PM
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Super Chevy (dec 02)recently did a write up on vibrations with the drive train. The car in the story, I think it was a Chevelle, developed a vibration over 3000 rpm. The author checked everything. He rebuilt the tranny, ordered a new drive shaft, balanced tires, and the rear end rebuilt. The problem was still there. Turns out it was the drive shaft. The drive shaft and yoke were balanced as a unit off the car up to 2500 rpm. When he hit 3000 rpm the vibration was still there. They used a device called the MTS 4100, which allowed them to balance the drive shaft in the car. Turns out that 2500 wasn't fast enough to demonstrate the small imbalances.

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post #3 of 7 (permalink) Old Apr 12th, 03, 09:30 PM
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Not being sure of the type of gear how about is it a rear disc brakes car. You might have more than the norm residual preasure causing heat causing any slight warping or distortion from over tight lugs to be amplified every passing by the discs.
Uh doing 60 right out of the driveway might not be the answer to try to find out if it does it with cool brakes.
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post #4 of 7 (permalink) Old Apr 14th, 03, 03:20 PM
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Check your U-joints. Can you feel slack in any of the drivetrain components (output shaft yoke, u-joints, rear-end yoke)?

Here are a couple of articles that may help.

Diagnosing rear end noise part 1
http://www.ring-pinion.com/gear/g0198.shtml

Diagnosing rear end noise part 2
http://www.ring-pinion.com/gear/g0298.shtml
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post #5 of 7 (permalink) Old Apr 14th, 03, 03:23 PM Thread Starter
 
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The rear brakes are drum. The driveshaft having a balancing problem is something that I'll look into. I did get a chance to drive the car again today and noticed that on smoother stretches of pavement that the vibration seemed to die away. I wonder if this might point more towards a bad tire?
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post #6 of 7 (permalink) Old Apr 16th, 03, 03:13 AM
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I just fixed a buddy's 67 camaro that had the same problems. We yanked out the driveshaft and had a driveshaft shop "true" it and rebalance. The shaft was slightly bent and had a ton of weights welded to it. Also have the shop check that the yokes are in proper phase (inline with each other) most stock shafts twist over time. Now it has two small weights and the car runs like a dream. Before you couldn't drive the car over 60 without your fillings falling out. Last weekend he took the car out and had it up to 90 with no problem. I would also recommend replacing the rear u-joint straps with the Moroso u-joint girdles. They are billet aluminum and provide more support for the bearing cap.

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post #7 of 7 (permalink) Old Apr 16th, 03, 03:16 PM Thread Starter
 
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Alright then, looks like I'll schedule some time to run over to the driveshaft shop nearby.
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