My JK has a pulsating vibe that starts around 50. My buddies and I have went over it thoroughly.
Here is the list:
Vibe is there when around 50 whether coasting, accelerating, coasting in neutral (trans, transfer case or both). It is prominent in the steering wheel but we have driven it sans front drive shaft and axle shafts and with different tires and wheels with no change. I do have a loose spider gear in the rear that makes all kinds of noise. Could this be the source?
Local offroad shop keeps blaming the trans and transfer case but I find this hard to believe.

 

Have you checked your unit bearings. I had a very similar issue and after checking all the usual suspects it turned out to be the driver side unit bearing. Something to check anyways.

 

What do you mean spider gear is loose? If there is slop in it there shouldn't be and i would replace asap before it grenades and takes out bearings or anything else. My dodge did that and took out tone ring, speed sensor. Also had a chevy ss do it (too much power to heavy of foot :-) ). How about outta balance rear driveshaft. See any weights missing?

 

The top spider gear in the carrier has about 1/4" of play. I know it's a problem. I have a rubi 44 housing in my garage, new ten factory 32 spline shafts, new overhaul kit and new R&P...just waiting on new locker to get here. I just wanted to know if that loose gear could cause a vibe to manifest in the steering. I can feel it from the rear but it's in the steering too. The unit bearings are fine.

 

It most definitely could

 

Changed entire rear axle out, all new parts. Changed front unit bearings. Still vibrating. What next?

 

Just curious but have you had rear shaft balanced

 

Short answer: No.

It's still stock and no weights missing. Jeep is at 24,000 miles.

 

Awesome JK BTW