Hi. Something that has been bugging my 02 grand cherokee for a year or so now. When I drive around 60-70 I get vibrations on the floor, seat and steering wheel. I have recently had my tires rotated, balanced and front aligned. Also, passenger side outer tie ride, (had play they said) new rear shocks, rear sway bar links, rear brakes and rotors as well as a brake flush. And now yesterday had my front/rear diff fluid changed as well as the transfer case. I also feel more vibrations in the steering wheel when turning on the freeway at these speeds. It just doesn't feel safe at those speeds. City driving seems ok. Before any of this started happening I kept having a problem with my front calipers sticking over the years. Don't know if it's worth the info. Just threw it in there. Any help would be greatly appreciated.

 

Sounds to me like a driveshaft problem, possibly u-joints. Check the double-cardon joint on the front shaft. It's possible you threw a snap ring on one of the u-joint caps, either the front or rear shaft. Check the bushing in the t/case where the rear shaft goes in for looseness. Pull and push it up and down violently and see if the bushing is worn out.