06 F-350 vibration at 40 mph

[stevekr]

I have a f-350 king ranch and around 40 mph it vibrates then smooths out took to shop said it looked good . Ido have new tires and allinment dose anyone have a thought on it. thanks

 

[F 150Cobra]

chek universal joints.. had a similair prob and it was one of the universal joints

 

[blacksnapon]

I have a f-350 king ranch and around 40 mph it vibrates then smooths out took to shop said it looked good . Ido have new tires and allinment dose anyone have a thought on it. thanks

How bad is the vibration? Torque converter lockup happens around 40-55 mph and can feel like a light harmonic vibration. Violent shaking will be something else.

 

[stevekr]

it just feelse out of balance

 

[d-kuzmen]

I would check ujoints and driveshaft center bearing have changed a bunch on king ranch trucks for some reason.

 

[stevekr]

thank you I will look into that