Chasing a vibration that shows at 45 and 65 mph. Front end components have been replaced. They were shot to begin with.

You definitely feel the vibration underneath and shakes the cab. I replaced the rear U-joints but they weren’t really that bad.

I’m thinking this is driveline related as I don’t get feedback in the steering wheel.

So my only two options are the u-joint by the transfer case or that center piece in the picture. Sorry can’t think of the name of it.

With that piece how much play should there be? I can definitely move the driveshaft up, down, and side to side. But maybe that’s supposed to be that way.

Any thoughts?

thanks!

 

If you haven't already done this, I'd suggest rotating the tires to see if that changes anything.

just trying to rule out the simple stuff first.....you never know.

 

When you are driving does your Center Console shake? The part you are referring to is the Drive Shaft Carrier Bearing.

 

yes. Shakes like crazy.

yes. Carrier bearing. Thanks.

 

So I may need to eat a piece of humble pie on this one. I figured after all the times it’s been in the shop they would’ve checked this.

My passenger side outside rear dual was significantly low on tire pressure. Basically half of what is recommended.

The road I took a test drive on after isn’t really the best road to judge a shimmy. But it was notably different.

So basically that outside tire was just along for the ride versus providing any support and just became an unbalanced object. This truck is also almost 14 years old so it’s not gonna ride super smooth anymore. But man do I feel like a moron.

 

Apropos of nothing, I just reinstalled my newly rebuilt driveshaft (08 F250 CCSB PSD RWD). I had significant vibration in harmonics (30, 60, 90, and so on). I VIDEOED the driveshaft at 30mph on jackstands. Yep, center bearing rubber diaphragm perished. However, I failed to mark the yoke with the shaft when removing, thereby boogering up the entire job. I removed the driveshaft yet again, replaced the U-joints, and took it to Driveshaft Services in Marietta, Ga. Thirty minutes and $60, and Bob's your nuncle. Worth every penny. Go do likewise.