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Discussion Starter · #1 ·
Do any of you get a little vibration in 4hi at higher speeds? :eek:
 

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I did for the first time yesterday after a boosted launch. Not sure what it was though.
 

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I get it above 70mph on a 4x4 boosted launch on the 300hp setting!
 

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I have a slight vibration above 55mph, feels like it is the front left side. I just drive in 2HI if at all possible. Only put it in 4HI when roads are really slick.....or racing. Then I just don't worry about it! Truck currently has 126K.
 

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Discussion Starter · #6 ·
It feels like the front driveshaft is not balanced for this kind of speed...
 

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A little vibration, a little humm, and at the turn off I noticeed the rear end was locked (felt like a spool while turning) pulled up to the slip window and it all went away.
 
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