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Both Aashish and Brian are on the right track.... maybe I can help a little as well.There are two main probable causes, but first we need to  know more about your Jeep (e.g. stock or lifted) and how you would describe this "shake". ifbb hoodieI say main causes because I am assuming that your Jeep is properly maintained (i.e. u-joints serviceable/not broken and they have enough grease, driveshaft is balanced etc. quick checklist here-->Action Machine - Custom Driveshafts & CNC Machining)IF the "shake" comes on abruptly and suddenly, with the steering wheel getting ripped out of your hands because it is sawing back and forth violentlylayla hoodie review, proceed directly to "DEATH WOBBLE".IF the "shake" is gradual and increases with velocity, go to "POOR U-JOINT GEOMETRY".tl;dr If you have lifted your Jeep a lot (3"or more), you most certainly have poor driveshaft geometry (you are asking the u-joint to operate outside of it's optimum angle, thus causing it to vibrate violently) which can be solved with a Slip-Yoke Eliminator (SYE) kit and new cv-driveshaft Example kit here -->Tom Woods Slip-Yoke Eliminator Kit Install on TJ WranglerIf you have lifted

your Jeep only a little (budget 1-2"), then you can likely solve the poor geometry with a budget transfer-case drop, as seen here -->Jeep TJ Transfer Case Skid Plate Drop Vibe FixIf Jeep is stock, you most likely have steering shimmy/death wobble, caused by some "slop" in your front end. At a high enough speed, an initiating event (like hitting a bump on the highway) will cause an oscillation throughout the entire suspension that will continue (due to that slop we mentioned earlier) until you slow back down. Cure is to find the slop and remove it (easier said than done). Handy checklist here -->Page on Kevinsoffroad    detailed explanationFor the record, I own a '97 Jeep Cherokee (which has almost identical running gear with your 2002 TJ) with a 4.5" long-arm lift (and a SYE).After I lifted it (but before I installed the SYE kit), I had the same problems with vibration at about 55mph. It would gradually increase in noise, harshness and vibration as I drove faster. Once I installed the SYE and new driveshaft, problem was cured and I was able to reach 70mph with no problems (other than poor mpg!)

POOR U-JOINT GEOMETRYWhen you lift your Jeep, the engine and transmission stay the same relative to the body, while your axles are further away (from the body). This is especially true on my unibody Cherokee (because the motor and transmission mount directly to the body). Side note: On a ladder-frame Wrangler, the motor/transmission are mounted to the frame, and the body sits on top. This is a "stronger" set-up and also gives you more options but at the expense of weight. When you push the axles further away from the transmission, you are asking the u-joints to increase the operating angle. U-joints do NOT turn at the same speed... there's a bunch of math involved here (and I am not good at math) if you are interested -->Universal jointThe greater the angle, the more changes in speed i.e. vibration. This is evident when you reach highway speeds. The SYE (and driveshaft) kit does two things: it allows you to use a CV-driveshaft which reduces vibration by design (hence the name constant-velocity), and also lowers the possibility of your driveshaft falling out of the transfer case.

Remember when you increased the distance between the axle and the transmission/transfer case? If you are using the stock  length driveshaft but increasing the distance required, then you run the risk of the shift shaft falling out of the transmission/transfer-case side when the suspension is unloaded (certain rock-crawling angles, or after a bump/jump). This would be catastrophic if you were travelling at any speed, since the driveshaft would effectively become a pole vault. Thankfully, the SYE kits reduce/eliminates vibrations caused by the u-joint angle, and prevents your Jeep from attempting to do to high-jump. For your Wrangler, you have the additional option of a budget transfer-case drop, which effectively decreases the angle slightly in hopes of reducing/removing the "shake". This would be worth doing if you are not looking to spend the cost of a SYE kit ($$$). DEATH WOBBLE / STEERING SHIMMY"Death wobble" is a generic catch-all phrase for any sort of "shake" that occurs in the front suspension.

And for obvious reasons, manufacturers prefer to call it "steering shimmy". Wiki here--> Speed wobbleThere are various causes of this, but is overall due to the fact that vehicle suspensions must do various (and sometimes competing) jobs. It must steer the vehicle, compress under load, absorb and dampen otherwise jarring shocks, and all the while maintaining low levels of NVH (noise, vibration and harshness). Suspension and steering slop could be due to aftermarket parts (worn or installed incorrectly or poor design or a combination of these factors) or worn factory parts, or just inherent in the design of the front suspension. Once again, it can be ANY combination of these causes!Usually, manufacturers try to engineer this sort of behavior out before they release the vehicle, but sometimes for whatever reason, they fail to catch it (I understand the Ford Broncos were infamous for this, and the Jeep Cherokee even comes with a steering damper from the factory to help prevent it from happening).

The actual mechanism that causes Death Wobble is either a Hunting oscillation or Self-exciting oscillation.... or a combination of both OR possibly something else entirely. But most likely one of those two -_-In a nutshell? The suspension is trying to find a steady state, but road conditions (which are increased at speed e.g. bump on highway) cause it to become unstable. To solve death-wobble, you will have to play detective to eliminate possible causes until it goes away. (Use the link from the beginning of this post!)Start from easy/cheap and work up from there-Are tires inflated correctly and balanced? -Is the alignment correct?It is absolutely essential that the wheels be balanced (this is even so critical for bigger wheels and tires) and the front-end alignment track straight and true. Finally, you get get under the front end and look around (using a flashlight is a good idea).-Are all bushings and joints in good working condition and filled with grease?-Are all fasteners tight? Here is another good link from Jp Magazine --> Fixing Jeep Death WobblesContinue until the problem is fixed (or you run out of patience or money).

Like I acknowledged earlier, this is sometimes easier said than done. It could easily be a combination of factors that cause your Jeep to shake at speed, but by eliminating possible causes one-by-one, you will work towards solving the wobble. I know this is imperfect, but without knowing more information on your Jeep, is the best advice!I really hope this helps you (or any other reader) solve the shake! Let me know if you have any other questions!Hi,Based on what you've written, I would say you have what is known as a "death wobble."  In fact, KGO in San Francisco recently did a piece on the news about it. and type in "death wobble" and read the 1,001 write-ups on it and potential fixes.  If you aren't handy, I'd recommend heading to a somewhere other than the stealership.  Typically, it's a bad steering damper (shock looking thing between your tires), your tires are out of balance, or your tie rod ends have excessive wear.  Considering the year of your vehicle, ti could be any one of these.