This is the 2nd Cherokee w/4 wd that I have had this problem with. At anytime on a highway the front end will go into a violent shake that sends me to the shoulder to slow down. Once I slow to about 30 mph it goes back to normal. It happened on my 1999 Chrokee 4 wheel and now on my 1997 Limited. If anyone has had this experience please help. Scarey to drive.