Oh boy! I'll try to give you a start on this..... hang on because it is not a simple one solution fix but vary's with each truck... . Ok here we go!
This is by no means an exhaustive treatment of this subject and I may be missing something and others will disagree with my selection of parts. There are many good track bars out there and I chose the Solid Steel 3rd gen track bar. Thuren among others makes a good track bar and you will get many opinions on track bar, steering boxes, rotors and shocks to name just a few.
The fix is different for each truck but generally the track bar is the first thing to check... that and look for any loose front tie rod or link and replace it. After that it is a witch hunt. This subject has been covered time and time again. Do a search on "death wobble" and you'll find lots of reading as I have.
It took me 2 years+ to fix mine. First, get under the truck while someone has the engine running and saws the steering wheel back and forth and look at both track bar ends for any movement... there should be ZERO movemet. I replaced the Lukes Link because it needed to be retighened as it was always loosing up on me.
Any loose front end part needs replaced like tie rods and links. Then come shocks, control arm bushings, sway bar bushings, end links... etc.
After looking for and replacing parts that have slop then set the caster for around 3. 5 degrees on each wheel and zero toe (that was a factor in wander for some). Here is a thread on alignment specs I did:
https://www.turbodieselregister.com...mission-discussions/144154-steering-woes.html
I fixed my 4 1/4 turn stock steering gear that was leaking at the output shaft with a PSC 3 turn light valving box. It can be steered with one finger now. PSC quite selling that Dodge steering gear but you can find others that do (powersteeringservices.com but search for the latest on this). Search for 3 turn (verses the stock 4 turn) steering box. To determine what yours is go full turn with the steering wheel to one side to the stop then reverse the turning counting how many full 360 degree revolutions the steering wheel makes till it hits the other stop. Stock is usually 41/4 turns. It is felt but some that going to 31/4 turn reduces the wobble effect. I like the 3 turn with light valving 16:1 that gives one finger steering.
Next look at the steering gear. While the wheel is turned back and forth look for a delay in input shaft verses output shaft (at pitman arm) or loose steering shaft. Some have fixed slop in the steering shaft column with the rocksolid steering fix.
As to what to do first... . you will get a different answer from each person... you research and decide.
Good luck,
Dave