Rear or under seat vibration

2013 FORD F-150
67,500 MILES • 3.5L • V6 • 4WD • AUTOMATIC
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Having a vibration issue that occurs at 50 mph and over. It feels like a rear tire out of balance as there is no vibration in the steering wheel. The tires and wheels are new and have been re-balanced to make sure the tires and wheels are not the problem. Also, the original wheels and new tires were balanced and still vibration in the seat. I watched the "slip Yoke" service video on YouTube and wondered why this is necessary and if that might fix my issue. Also after Googling my issue I found videos of drive shaft run out.
Feb 28, 2020 at 6:44 AM
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ASEMASTER6371
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Good morning,

I suspect a bad universal joint for an issue like this.

Look for any rust at the cups on the driveshaft. That is an indication of a failed joint.

I would remove the driveshaft to inspect the joints to see if they move freely.

Roy
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Feb 28, 2020 at 6:57 AM
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SCGRANTURISMO
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Hello,

This could be a problem with your vehicle's U joints going bad. When they start to fail they will cause your drive-line to wobble and will cause a vibration issue. Here is a link to a guide below explaining what happens when U joints fail and what to look for:

https://www.2carpros.com/articles/how-u-joints-work

Please go through this guide and get back to us with what you find out. We can go from there if needed.

Thanks,
Alex
2CarPros
Feb 28, 2020 at 6:58 AM
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