Hi Tween! What is the condition of the hub bearings? Do they pass the tests? How about the wheel joints? Did you replace these? I did this in my first Ram by beating them out. I bent the yokes doing this. Got a vibration I couldn't find, or fix. So you say it comes and goes with hard right and left turns? Hub bearing. If you do find that you you need hub bearings, try Amazon, and use the Timken bearings. Much better than the crap you can get at Autozone. Seriously, jack the truck, and wiggle the wheel. That should tell you the health of the bearing. There should be NO play.
The difference between genius and stupidity, is that genius has it's limits. A. Einstein