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I have had my Wrangler for 2 1/2 years and never had this problem.  I bought it brand new.  Three weeks ago I had an oil change and my tires rotated.  I say this because I wonder if it had anything to do with what happened a few days ago.  After driving on flat, straight road at about 55-60 mph, my Jeep suddenly started shaking very badly.  When I say very badly, I mean I have never experiences anything like this before.  It felt like the wheels were coming off.  The engine sounded bad and there were some burning smells.  I slowed down to a stop very quickly and the shaking stopped.  I was able to drive home at 30 mph.  I feared going any faster.  Once home, I checked under the hood (not knowing what I was looking for) and noticed a part of the serpentine belt had peeled off.  The belt was still running, but it was clearly damaged.  Also, a metal piece of some sort fell off from underneath the Jeep in my driveway.  It is under warranty, and the mechanic at the dealer said the only things in need of fixing were the serpentine belt and the tensioner.  I guess the tensioner failed and shredded the belt.  He said the metal piece was some "assembly" piece that was not needed.  (the tow truck driver thought it was a radiator clip...hmmm)  The mechanic didn't seem to fully think the tensioner and belt caused the shaking.  Now I don't know what to do or think.  I am afraid to drive my own car.  Does anyone have any advice or words of wisdom?  I would greatly appreciate it.  I am at a total loss.... Thanks  

for front front tire wobble problems on these jeeps..

change the steering damper...   it is located on the steering linkage... infront of the axle... it is a shock absorber... that is designed to dampen the wobbles before they can be started.. the steering dampers do wear out...

when tires are changed.. the mass of the front end is different...  so the factory damper that is worn may not be up to the job...

some steering designs have this problem.... it is just part of the design...  if they could design it without a damper.. they would..  

damper shock , i have a  big problem with my wrangler..