Front D-Shaft Likes to do the shimmy - Defender Source
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  #1  
Old April 15th, 2006, 03:56 PM
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Front D-Shaft Likes to do the shimmy

I am getting driveline vibes between 40 and 50mph during acceleration. I have a new GBR double cardon shaft and the SG 3 link with it setup to point the pinion almost in line with the shaft so the angles are the same. What gives. I removed the shaft just now and its smooth sailing..
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  #2  
Old April 15th, 2006, 04:47 PM
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I hate to say it but pull the drive flanges & have the whole thing balance together.
If I remember correct my pin angle & ds angle are 3 degrees off. if that helps
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Old April 15th, 2006, 05:01 PM
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Thats what I was thinking of doing since its off. I guess even a new d-shaft could be out of wack.. And I guess thatwould give me the shakes. I played around a lot with the angle thinking that was it but no matter how I put it, It still vibes..
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Old April 15th, 2006, 05:03 PM
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Its not so much the shaft as the flanges. Once balanced as a whole mark em!!
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Old April 15th, 2006, 05:07 PM
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YOu mean the flanges on the t-case and the diff?
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Old April 15th, 2006, 05:13 PM
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Correctamundo! My ds guy does the whole shebang.
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Old April 15th, 2006, 07:39 PM
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Wow. Never heard of this before. I will have to check it out. Should I first just bring the shaft and see if its Fu&%ed up?
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Old April 15th, 2006, 10:04 PM
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You know its worth a shot. I would call my local driveline guy & see what he says. I did not do both flanges only the tc side. I was worried about loosing pinion preload.
did you line up the marks that bill has on the adapter & ds? I am sure you did.

is the noise different on acc or dec? perhaps a differential noise?
I hope a balance job does the trick..
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Old April 16th, 2006, 07:22 AM
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Actually Pete, I did not line up anything. There are marks on the adapter and ds????
I actually only get the vib during harder acceleration. I guess when there is more of a load on it.

Where would the marks be for me to look at this...
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Old April 16th, 2006, 11:00 AM
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Well there should be a V on the adapter & shaft [those need to line up]. This is how the shaft was balanced.
I am thinking I have never had a shaft vib under acc. Could you have a ring gear preload issue?
Before you flip find the marks on the shaft if they are lined up well you need to dig more.
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Old April 16th, 2006, 02:31 PM
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I will reinstall with the V lined up. I just found the marks. I doubt they were...
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Old April 16th, 2006, 03:57 PM
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Let us know if that fixes it. I doubt it will. If it is happening under acceleration, chances are your pinion is pushing upwards. There might be something loose on your 3-link.
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  #13  
Old April 17th, 2006, 01:29 PM
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So far so good. I drove it to work this morning and it seemed fine. When I had it off I also noticed a lot of mud caked inside the adapter and all the bolt holes which might have thrown things off too.

I reinstalled it with the V marks lined up also this time..
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  #14  
Old April 17th, 2006, 01:31 PM
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Glad to hear it!! One less thing to worry about.
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Old April 17th, 2006, 07:51 PM
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Yup.. seems to be fine. No vibes..
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Old April 17th, 2006, 09:08 PM
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