Very specific vibration: Could it be a u-joint?

wolf1790

wolf1790

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Didnt really want to make a post about this but here I am.

Have a vibration at highway speeds but only in VERY specific circumstances:

When I'm at around 60-70mph and giving it gas, but so little that I'm almost slowing down, not maintaining speed. If I take my foot off the gas, accelerate harder, or brake, no vibration. It's not super severe, but definitely noticeable. I haven't been able to have anyone lean out and check the tires for wobble and I can't do it myself on the highway.

Also, I feel it in the jeep itself but not in the steering wheel.

Could it be a U Joint or the flange on the front outer axle? I somehow bent one installing a U Joint last weekend which is when this started, but managed to bend it back (I thought). Its the only thing I can think of that's changed.
 
If you bent a flange I'd replace that first. Looking at the only thing that changed is really smart. It might not fix it but is probably a good place to start or at least what I'd do.
 
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Daryl said:
What flange are we talking about?
Click to expand...

Screenshot_20190605-230934_Chrome.jpg
 
Check and see if that yoke is interfering with anything, such as the heads of the bolts for the unit bearings.
 
Daryl said:
Check and see if that yoke is interfering with anything, such as the heads of the bolts for the unit bearings.
Click to expand...

Yeah I did a pretty intense visual inspection when I put everything back together. No interference and no wobble or anything that I could see with the naked eye at slow speed.
 
That shaft never spins fast enough for it to be a balance issue. Something else is going on. Get under the Jeep and review all the work you did. Check your driveshaft ujoints and slip yokes for movement.
 
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