Truck darts to the left or right when it hits a jarring bump. I have replaced all steering linkage gearbox balljoints and I-beam pivot bushings

Thats called a shimmy. And you have shocks instead of struts.
Chances are you have a ball joint or tie rod end about to fail. Something is very loose in the front steering or suspension. I'd put money on it being a ball joint.

You have worn parts, what those may be requires a skilled front end tech to find.

if you installed bigger tires not the factory tire recommended then you need some additional sway bar support. otherwise you are driving wiith a bit woobling.......

Not safe to drive like that. You have a bad balljoint or bad steering box minimum.. What is happening is the front end has mounting pins called Balljoints and they keep the wheels attached to the body of the truck. One or more of those pins are getting ready to come off of your truck

You will not be able to steer your truck, the body of the truck may hit the ground and you will not be moving after that. I can not really suggest you drive to an alignment shop. This sounds like a Park and Tow job.

Could possibly need the steering box adjusted. It might be a little loose. And tire balance usually makes it shimmy. Could have a broken belt in one of the tires. Jack up the wheel and spin the tire and check the run out. (look for a wiggle when spinning the tire).

replace the stock steering stabalizer. the stock one is known to go bad

This sounds like a loose connection to the motor itself. My truck has been doing that lately and I finally figured out the problem only when I starting digging under the dash while the heater was going.

When you turn left or right, the steering column must be tugging on the wiring, and when you hit a bump it's just enough to jar the connection loose. Check where the plug goes directly into the motor...most likely it's under the dash on the passenger side, or on the firewall on the same side, but in the engine compartment. It could also be that your steering column has worn the coating off of the wire and it is shorting out every once in awhile when the exposed wire hits metal.

I had a truck at work that did the same thing. Only if you hit a pothole. In my case the front tires were way out of balance. Hope it's something that simple.

The bumps do initiate the shaking. When my 2006 Ram 2500 4x4 started shaking, I had just had it aligned that morning. A month or so before that alignment, my passenger side outer tie-rod broke while driving down a rock road. I replaced it with a heavy duty MOOG tie-rod end. Anyway, the same day I had it aligned I was driving back home from a job and towing my bobcat behind me. I hit a bump and the truck did the "death wobble" with the front end shaking violently up and down in an alternating fashion (one tire in the air while one tire on the ground and then vice-versa). I changed the tires first (which were worn-out 305/75/17 mud tires). Since the day I bought the truck new in Jan. 2006, I've had larger tires on the truck than the tiny 235/75/17s that came with it and I've done a lot of heavy towing with it and never had a problem until this alignment was done at Sears. I;m still trying to figure out if it was the alignment specs that they used or if the problem coincidentally started that same day. I also changed the steering stabilizer. Neither the new tires nor the stabilizer/damper helped the problem. So I changed the other outer tie-rod end and the upper and lower ball joints (all MOOG with grease fittings). I turns out they were worn out. So, the truck no longer shakes violently up and down when I hit a bump. That problem seems to be in check. However, now when I hit a bump the truck's front end wobbles side-to-side. I can do a few things to recover from it. I can hit the brakes pretty hard and sudden (which can cause an accident on the interstate), or I can **** the steering wheel side-to-side a few times (from 10 o'clock to 2 o'clock) and that stops it immediately...until the next bump in the road. Also, if I let my foot off the accelerator just before hitting a bump and let the truck coast over it instead of power through it, sometimes the truck will ride over the bump without incident. I found out yesterday on a 5 1/2 hour road trip that if I did 80 to 90 miles per hour and powered through every road blemish, the truck rode fine...no shaking at all. I suppose the high speed forces the tires to stay straight when they hit a bump. Lastly, to confuse my problem solving attempts further, sometimes the truck rides like a cadillac (for an hour or so) at regular speeds and no matter what bumps I hit. Then without worning, the front end will loosen up and get that sloppy feeling again and the wobbling comes back at every bump...until the next time it feels like tightening up and driving right again. I have no idea what to do now. I'm going back to Sears today to have them check their alignment. Other than that, all I can think of is to change the rest of the steering components and check the steering box for malfunction. I hope someone can help all of us Dodge owners out off of the road tested info that I've just provided. Dodge doesn't seem to care to address the problems with their trucks front ends, and we need a solution before people get hurt or die. I was almost run over by an 18-wheeler trying to figure out how to handle the shake. I can't afford to buy another truck. So I need to fix this one so I can keep working. If anybody has a concrete solution to these problems, please let us know. I've read 20 different opinions from mechanics on these blogs, but nobody has said yet that they fixed someone's truck with these problems and have since heard from that customer and everything is still working fine. Opinions are helpful sometimes, but they're also confusing when they're conflicting.

The problem may be in the steering gearbox and can be dangerous as you noticed, get to a mechanic