Bucking, vibrating, grinding noise '00 Expedition
 

After I had new tires put on, my '00 Exp (112K miles) seems to buck a lot now, especially after turning. I brought the vehicle back to the shop for a rotation & balance but now it sounds worse. Sounds like there's grinding under the vehicle while it bucks. I'm assuming it has something to do with the axle that drives the rear wheels. When I put it in 4x4 it sounds A LOT worse. I'm thinking the guys that lifted my car (with a jack) somehow messed it up. Any ideas?

RE: Bucking, vibrating, grinding noise '00 Expedition
 

This is very similar to a problem that I started having this week with my 99 Exp. Even to the point of having my tires changed. Strange... Anybody have some suggestions on what to check?