Jeep vibrates when driving 45 mph or more - 1995 Jeep Grand Cherokee

Have you checked air in tires? let me go over some things to check for you.it could be a bad ball joint on either the passenger or drivers side front.could also be a bad universal joint in the driveline shaft. have you had it off road lately and hit something in roadway?it may just need alignment.to check ball joints you'll need to jack front of car up, make sure to use jack stands to insure safety. with it up in air check for in and play in each wheel, physically push top and bottom of each wheel in and out. if there is play in tires, most likely a bad ball joint.or to check driveline u joint,recommend you leave it to a pro.it entails you crawling under the car while on jack stands w/car in park and emegeacy brakes on. shake drive line up and down, if there is any play in it. the u joints bad. ther are 2 1 infront and 1 in back next to rearend. hope this helps and thank you for visiting fix ya