when I back in my driveway a slight up hill. The whole jeep shakes. Shimmies, Like when I had the death wobble but on a smaller scale makes me thing my fron drive shaft my be going? but no problems going forward up the drive way which is about 20 feet at maybe a 15% grade.

 

Mine does it when reversing up something slick, pretty sure its the esp. I haven't noticed it on pavement though.