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What wheels and tires are you running? Are they the stock Rubicon MOAB wheels? Cool build thread, thanks!

This guy is awesome. Check out 7:00

I used a grinder to eliminate the interference. The shock sets my droop limit. I also spent a lot of time scratching my head and wondering what was going on here.

When I bought my 2003 Rubicon it had an RC 4" lift plus a dropped pitman and "hydro" shocks. This lift but with hydro shocks: https://www.extremeterrain.com/rough-country-4-suspension-kit-tj-907s.html Although not RC, the first thing I replaced were the shocks with some RS5000X's. Huge...

Agree with your overall assessment. The load vectors should be the same for both figures above- as nothing has changed with the load path from the bump through the tire in either figure. What does change is the angle of the arm with respect to the load vector, and how that generates up force...

It doesn't. You could put a straight edge on it and it would line up- more tire material on the outside, less on the inside. Strange... hopefully it was just the toe out. The inner is almost down to the tread wear marker, and the PO said he only had 10k on them. (K02's 33") Hopefully it...

Actually, the force or damping transmitted versus the angle from vertical is sinusoidal. Zero degrees from vertical is 1. 45 degrees is ~30% less. In-between angle results jibe with mrblaine's reductions. Angle Cosine(Angle) 0 1 10 0.984808 20 0.939693 30 0.866025 45 0.707107

Not to thread jack, but when I got my TJ all tires were worn unevenly- more wear on the inner (beveled from outside to inside). I suspect it was toe-out, which I have corrected, but what else might cause that? Thanks!

I heard a pop (while wifey was turning the wheel) after installing our new Currie track bar, and i think it was caused by 1) an enlarged axle track bar bolt hole (axle side) and 2) re-using the factory bolt. I think the insufficient pre-load of the re-used factory bolt and enlarged axle...

Replaced the stock track bar bolt (axle side) with a larger grade 8 bolt- 7/16"-20, 3" long yellow passivated bolt from ACE. I ground the old nut off its retaining tab, then ground the tab opening to capture the new grade 8 nut. Inserted the tab onto the nut using an socket larger than the...

I have not performed the articulation to check bumpstop yet... hopefully next weekend I can pull the springs and articulate to check.

I just installed the Savvy/Currie 4" lift, and was wondering what limits the axle droop? For example, if the passenger side is at full bump stop (compressed), what limits the driver's side droop (extension)? When I was installing the kit it looked like the control arms hit the axle, but that...

Thanks for posting this, I have used this method successfully. I have a question- if I want to do a quick toe in check can I use the tire parting line in the center of the tire instead of flat stock? Or should we not assume that the plane it creates is perpendicular to the axis of rotation...

It is interesting that you see temperature affecting it that much. I would think that elevated temperatures after driving would affect tire temperatures and stiffness more than the stiffness properties of steel driveline/differential components.

You can also try a vibe app as mentioned here: https://www.motor.com/magazine-summary/fixing-vexing-vibrations-march-2018/

I don't always drink beer, but when I do, it's after working on my TJ!

Has anyone with this issue tried to upload an app to their phone to measure the frequency content of the vibration using the acoustic signature? That could be helpful to identify the problem. Something like this: https://itunes.apple.com/us/app/audio-spectrum-analyzer-db-rta/id1281873790?mt=8...

I just did this on my 2003 Rubicon we bought a couple weeks ago (it has a 4" Rough Country lift which is soon to be replaced with a Savvy 4" lift). I took the dropped pitman arm off and installed the OEM pitman arm, and it made a HUGE difference! No more scary bump steer. I also replaced the...

Wow, that is a long chase! Thanks for sharing. Since the rear differential (pinion/ring gear/driveshaft) would normally be loaded by engine torque, I'm not sure the "unloaded driveshaft slop" theory would apply. I know you said its stock, but have you checked output shaft and pinion angles...