I just bought an 04 2500 4x4 that had the death woble fixed before I got it. I think this is the same frontend as yours. It got new Heavy Duty parts from Mopar. The parts included, tie rod ends, center link, steering stablizer, pan hard bar, and a Napa steering box. The mech that did the work said the new HD parts from Mopar are a lot bigger in diameter than the original or Napa parts are.
I don't know what parts fixed the woble, but when I got the truck I could not keep it in my lane without constant input , left then right,left,right.........
I got the truck home and since it just got a new steering box I figured it needed adjusting. I loosened the adjuster on the steering box 1/2 a turn and now it's a lot better. Now I can relax when driving and it's easy to keep in my lane.
I think maybe someone tightend your steering box, trying to get rid of the woble(this is what my guy did) and caused another problem. If I were you I would try to loosen the adjuster 1/2 turn and try it. It's easy to do and if that isn't it then just put it back, just keep track of how far you move it. The adjuster is a bolt with an allen head in the top, with a nylock nut to lock it in place. It's located on the top towards the front of the steer box.
You need to hold the bolt from turning with the allen wrench, while you loosen the lock nut,
then turn the bolt 1/2 turn counter clockwise with the allen,
then while holding the bolt in place, tighten the lock nut. and take it for a ride.
If that doesn't do it then try this steering box stabilizer link below. http://www.dieselperformance.com/ind...uct/index/151P
I am going to get one for my truck, but haven't tried it yet.
Like the link says you need to make sure all your front end parts are good first.
Hope this helps. Keep us posted.
P.S. I have an 07 Yamaha FJR 1300. Life is short so ride safe and ride often