Why is my truck shaking at 70 mph? - Ford Powerstroke Diesel Forum
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Old 08-04-2013, 01:20 PM
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Why is my truck shaking at 70 mph?

According to specs on the door I should be running 55psi in the front but I'm running 70psi. Could that be my problem?
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Old 08-04-2013, 02:53 PM
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No clue as to what kind of truck you have. It could be a few things from suspension geometry, tires, a u-joint, carrier bearing etc. Is it coming from up front, back, dont know? You're going to have to be a little more specific.

I would only gauge what your PSI should be based on your tires. Read the sidewall and adjust accordingly when you have not driven the vehicle and the tires are cold. I generally set mine 5 PSI below the max. Everybody will have different suggestions based upon their driving/towing. Stand by.
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Old 08-04-2013, 10:51 PM
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Check your tires for tread seperation usually evidenced by a bulge in the tread area. If it's been going on for a while the area will be worn more then the rest of the tire too. Also have your tire balance checked.
Tire cupping caused by alignment issues might be the problem too but will be more of a vibration than shake.
If it's making the steering wheel shake concentrate on the front, if not felt in the wheel, the rear.
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Old 08-05-2013, 12:42 AM
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is it only when your giving it gas or all the time? is it in the wheel or the whole truck? worse at different speeds?
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