Another welcome. I wasn't at the meeting last week, but nice to see a fellow Lafayette'ian here.
Our trucks are pretty different, but as it relates to vibrations, I have a few..... I have pinion angle issues on my rear shaft that creates low speed vibration (around 10mph +-). My higher speed vibrations (45-55) are definitely an issue with wheel/tire balancing. Vibrations mostly go away at interstate speeds, which is probably why I'm being lazy about them.
I've shimmed my rear diff around 2-2.5*, but I can't get the vibrations to go away (unless I pull out the OME suspension).
1976 FJ40 - green and mostly stock
1996 FZJ80 - not so stock