It's the road that isn't perfect. A perfectly balanced rig (if one could be built) on a typical stretch of road is going to have natural forces pushing the perfectly balanced rotating parts into other directions.

 

I've had a shake I couldn't... shake for the last 2 years until this past weekend.

I finally added dynabeads and removed all my wheel weights and wow... feels so good! I'm never using wheel weights again. I had the tires balanced 4 times over the last 2 years and each time they felt a bit better for a day or two but then the shakes would come back.

Running 315/70/17 MTZ on AEV rims

 

Good comment. Road input is for sure another possible factor when things shake. On a rig with enough mechanical slop, road input could start a harmonic vibration that would shake until the Jeep stops completely (AKA DW).

Pretty easy to tell if the shake is from road input or rotating input. If the shake starts each time the Jeep reaches a certain road speed then the cause is probably rotating input. If the Jeep runs fine until shaking starts suddenly after a rough section of road, then the cause is more likely to be road input.

With a tight and correct front end, road input won't cause continuous shaking but bad rotating parts will.

My earlier comments were about shakes that are continuous whenever rotating parts reach a certain speed.

 

We have plenty of roads here in CT that are like that. They look smooth at speed but rattle the whole jeep.
This was posted in yesterday's paper


2007 Rubicon /2 door/6 speed

 

Thanks for all the input! Went and talked to my guy at 4WP and said pretty much everything y'all did. BUT, he added to try and drop the PSI 1-2 PSI in the tires. Well i did and BAM, fixed. They also got rotated AND my spare showed up. My jeep only has 61,xxx miles on it and everything seems to be in good order. Ball joints will be upgraded to syngery when the time comes but as of now they look/feel fine.