my 2006 6.0 shakes at 44-45mph
 

Hello my 2006 F-250 6.0 Crewcab 4x4 shakes up and down not side to side between 44-45mph wheather I am on the petal or just coasting down the road. I have had the truck for about 6 months and it has always done that. I dont know if its something with the transmission or sonething else

does it have lift or bigger tires?

When i bought it the guy told me it didn't have anything done to it

Sounds like you might have an out of round tire.

I never thought about that I'll get it checked out thanks

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well if it is an out of round tire wouldn't it do it all the time not just at 44-45mph because before and after that it stops shaking