Rear or under seat vibration

STEVE.R.BELL

MEMBER
2013 FORD F-150
3.5L
V6
4WD
AUTOMATIC
67,500 MILES

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.

Friday, February 28th, 2020 AT 6:44 AM

2 Replies

ASEMASTER6371

MECHANIC
52,796 POSTS

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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Friday, February 28th, 2020 AT 6:57 AM

SCGRANTURISMO

MECHANIC
4,897 POSTS

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

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Friday, February 28th, 2020 AT 6:58 AM