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OK, I have the 3.5 RE Superflex lift on with a new driveshaft. No vibes, but there is a harmonic resonance at around 55mph. I have the automatic. Anyone else have this problem and, if so, what was the fix. The noise is irritating. Thanks.
 

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i had a vibe from 45 to 55 and it was my pinion angle...
has to play with the front and rear to find a happy spot.
even had Tom Woods replace the drive shaft a few times..
1 deg down the Rubi needs to have it just right.

:wink:
 

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jimnor said:
OK, I have the 3.5 RE Superflex lift on with a new driveshaft. No vibes, but there is a harmonic resonance at around 55mph. I have the automatic. Anyone else have this problem and, if so, what was the fix. The noise is irritating. Thanks.
I have the same condition running a 4 inch lift on the auto with a TW DS. Haven;t tried to chase it down yet, but I belive my pinion angle is a little high. I'm going to follow mac's advice as a first attempt.

Jerry
 

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Me too....I have a 5 speed and it is still there. I had gotten rid of it and now everything is settleing and changing and now I am back to the vibes...
 
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