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Trucks Rule
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490 Posts
Discussion Starter #1
I have a pretty good vibration coming from the rear. It only comes at around 80-90 mph. Around 90 it gets pretty bad. It seems speed based and not rpm based as I dont get the vibration if I have it in 2nd gear and wind it out to 4-5k rpms. I had my 4.56's put in about 2 months ago so I'm wondering if its a pinion bearing or something like that?

Maybe its the driveshaft? out of balance? are these externally balanced drive shafts?

Thanks for any help
 

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660 Posts
Well I am no help diagnosing vibrations over the net? But I can say after installing my 4.10's I had a vibration problem. The next stop for me was the driveline shop to get my driveshaft balanced. They told me it was bent. After straightening and balancing is has been smooth sailing.
Good Luck.
 

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HOTROD
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590 Posts
:loud: SLOW DOWN!!!! No I also believe that you might have knocked your drivshaft out of balance. Happened to me once got it fixed no more vibrations
 

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Never mind.
 
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