Chrysler Jeep had to recall all the export models of the 1999 Grand Cherokee and change the suspension bushings to kill death wobble. The durometer (hardness) was different on the export suspensions, and that allowed the harmonic to take effect.
Worn parts is generally NOT the problem (an argument I have on an almost daily basis on the several Jeep forums I've hung out on). My very first experience with true death wobble (as opposed to tire shimmy) was in a brand new 1999 Grand Cherokee that was completely stock and had never been off-road. It happened once, and never came back even though nothing was replaced.
The so-called “death wobble” is relatively common among vehicles that use a solid front axle, and the Wrangler is the only light truck currently on sale that falls into this category. The design is prized for its extreme off-road and heavy duty hauling capability. The wobble is a harmonic resonance resulting from a loose or worn part in the steering or suspension, such as a tie rod end, and usually set off by hitting a bump at a certain speed. It often goes away after the vehicle stops, but can return under similar circumstances. However, if not addressed, over time the vibration can cause damage to other components of the vehicle and exacerbate the issue. Many websites targeted at off-roaders have sections dedicated to fixing the issue on a variety of vehicles, which is often the result of installing aftermarket parts.
BS. The cause is invariably tire imbalance. And death wobble cannot cause wear to other steering components for the simple reason that you CANNOT drive a vehicle that is experiencing death wobble. There's a reason why it's called that.
In a statement responding to the letter, Chrysler says of the condition that, “if experienced, it is routinely corrected with a change of tires or installation of a simple steering dampener.” The automaker has issued several Techincal Service Bulletins (TSB) related to the steering system of the Wranglers in question, but hasn’t said if they are a direct response to the alleged issue. TSBs are issued to dealer service departments to inform them of a known problem with a vehicle and instructions on how to deal with it, but are generally not made public.
More BS. I'm pretty sure all Wranglers come with steering dampers. I know my Cherokees all have one. Changing the tires changes the balance, and THAT's the crux of the issue.
