I had a similar problem with an '83 Grand Jeep Wagoneer. I would get the dreaded "death wobble" and it would scare the crap out of ya. Mine turned out to be loose u-bolts holding the axle to the springs. I sounds like you have more problems and I don't think it is advisable to drive it until you get it fixed. A broken track bar along with loose bushings could easily cause such problems.
'08 1500 Ram, Quad 4x4 Bighorn, Silver, 20" wheels, 5.7 Hemi/MDS, 3.92 axles
"Meddle not in the affairs of dragons, for thou art crunchy and good with catsup" -Doc, IFSJA