What you are describing is what we like to call the death wobble. Their are many different opinions on what causes it. Usually it is caused by a worn steering stabilizer. But just replacing it with a new stock one is not going to last you very long. I would advise you to purchase a dual steering stabilizer kit from skyjacker or superlift. Its actually cheaper to buy the kit than it is to buy a singal mopar shock. It will take care of all your problems. Also if your steering linkage has not been updated to the newer heavy duty style you might want to check with your local dealer.
285/65/20 BFG , Weather tech floor mats and vent visors , Amp Research Power boards , Console Vault , Mopar side door moldings painted bright white , Avs aero skin bug shield , Daystar leveling kit , Many more to come!:smileup: