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Death wobble, and bump steer are both symptoms of adding a lift/big tires, incorrectly, and screwing up your suspention/steering geometry. It's fairly easy to correct.
Check out Jeep forums, this is a common problem.
There is also a very good chance that you just lost a wheel balance weight. I'd take it to the dealer first and ask them to re-balance the tires. This is exactly how a vehicle will act if one of these balance weights comes off.
It could also be that your lug nuts are loose, or broken off.... I am amazed at how many mechanics put the lug nuts on with an air gun, and tourque them down waaaaay harder than they are supposed to.
Bump-steer occurs in any TRUCK with a solid front axle. A stabilizer is sometimes added to the stock setup to help it. Even Ford put a stabilizer on my '01's front-end. Which didn't help. A Rancho made the bump-steer go away.
Maybe I missed it in your post, but did you put FOUR (4) Billstein shocks on your truck?
Yes I put (4) Bilsteins on my truck. I also put (4) Bilsteins on anything I buy new.
The OEM shocks on any vehicle are the worst on the planet.
When I drive I want to enjoy the ride, and Bilsteins give me that. Rancho used one of my vehicles as a test vehicle for their shocks and took me on a plant tour and gave me a short course on shocks, but like they said the OEM shocks cost about $7.00 ea., so it's a ownder any ride is better when OEM shocks are replaced.
As the guy who started this post, and had the death wooble, I would suggest the dual steering stabalizer. I tried the alignment, wheel balancing, tightened bolds, pitman arm, geometry, etc. There are as many theories on how to fix this problem as there are male hair enhancement creams!
The dual steering stabalizer is relatively cheap fix. Im sure you can puchase and install for under $300.
We have developed a permanent fix for the wobble. We redesigned the track bar to eliminate all the lateral movement of the front suspension. I have sold over 40 kits with 100% fix
I found a 100% effective fix myself. I gave Ford back the piece of junk, and got a 2009. Fixed me right up, and it only took me 3 years to figure it out.
wf