Thats called death wobble, and is very common on lifted Jeeps.
There are many causes, most of them are a loose or worn track bar bushing. Try tightening the track bar mounting bolts, look it over really close. Have someone move the steering wheel back and forth and see if the track bar moves. It should not.
Could also be worn control arm bushings. I believe that that year Ram is coil spring in the front? Check all the bushings in the control arms.
A steering stabilizer is never the cause of the problem, It can control it sometimes. You should be able to drive a vehicle wit no steering stabalizer and not have it wobble.
