highway shudder

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Jul 9, 2018 | 07:11 AM

mvj

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highway shudder

I have a brand new 2018 F-150 XLT 2.7L Ecoboost that has a shudder at highway speeds only when my foot is on the gas. I can stop the shudder by releasing the accelerator at any time( i know it isn't tires or alignment) It does it at random speeds both accelerating and driving a constant speed. I have taken it to the dealer 3x and they put in a new rear diff. still does it almost worse now. what else could it be? if it was the trans it would do it when switching gears but only does it when it is in a gear.

Jul 9, 2018 | 10:05 AM

JKBrad

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From: San Antonio, TX

Drive shaft balance. That’s the first thing that came to my mind. Surely the dealer checked that before replacing the rear end.

Jul 9, 2018 | 12:25 PM

mvj

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yea they are telling me that the vibration is in the engine from their analyzer. said it is 13Hz in the engine. sometimes it feels like the engine is skipping. sometimes it feels like it should have down shifted and is under load.