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Drive shaft Vibrations

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Old 10-05-2009, 06:25 PM
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Question Drive shaft Vibrations

I have a 1988 Full size blazer that I just installed a 4inch lift and when I took it for a test drive down the road I noticed that when I let off the gas, I could feel and hear what seemed to be my rear drive shaft vibrating. As soon as I got on the gas it would stop and start again when I let off the gas again. Any ideas what would cause this. Anything helps.
 

Last edited by Straka88; 10-05-2009 at 06:33 PM.
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Old 10-05-2009, 08:18 PM
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Could be the u-joints or could possibly be a worn slip yoke at the back of the transfer case.
 
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Old 10-06-2009, 11:24 PM
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Did you have the drive shaft off?
 
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Old 10-07-2009, 12:26 AM
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Yes I had my drive shaft off and I had my buddy looked at my U joint and said it was good, but now I'm just going to replace it anyways. I it look old to me.
 
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Old 10-07-2009, 01:52 AM
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High mileage u-joints will vibrate when their "worn in run patterns" are changed with things like greater angle due to a lift. Should be an easy fix with new u-joints.
 
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Old 10-08-2009, 12:42 PM
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Originally Posted by Straka88 View Post
Yes I had my drive shaft off and I had my buddy looked at my U joint and said it was good, but now I'm just going to replace it anyways. I it look old to me.
I always mark the driveshaft and the yolk (with chalk or paint) to make sure that it goes back in the same position as it was removed. Changing the "phase" can cause a vibration. You may have to rotate the driveshaft at the rear u-joint.
 
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