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There is a strange, strong vibration that comes from about where the tunnel is. This vibration occurs at about 90mph which is about 3500rpms.
What leads me to believe it is the driveshaft is that the vibrations does not occur at 3500rpms at any other speed.

Can anyone verify my theary? and if it is the driveshaft, what can be done about it.
 

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I get the same vibration at about 85+ but I have an extremely fine tuned and well balanced aluminum driveshaft with all new u-joints.

I can't figure out what it is either. ??? If you find it please let me know. I'd really appreciate it if you would keep my address and e-mail me directly.

mailto: [email protected]

Thanks
Doc the moneymanager
http://jmichael.info/exhaust13.jpg
 

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Thanks but I'm one of the one who have pointed that out before myself. Not so in my case. Mine is all HD. hand built and brand new. It's solid and the pinion angle is right on the money as well. Below is a photo is mine.

THANKS
Doc
http://moneymanagment.info/tranybrace.jpg
 

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You could always try to flip it 180* and see if the problem goes away. I don't try to understand the dynamics of balancing rotating assemblies (although I work with them every day), but I had a strong vibration at higher speeds. Rotated the drive shaft 180* and smooth sailing ever since.

Worth a shot before you have to pay to have it balanced!

Frank
 

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I second the suggestion for tranny mount. I checked my u-joints and paid for shaft balancing then ultimately turned out to be the mount. We didn't find it until we were able to get the car up on a lift. Rolling under didn't show very much.
 
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