A couple major assumptions here to start. First, I am posting this issue in my build thread as if enough people or the right people actually read it rather than it needing its own thread. Second, that those people are fed up with sports and won't be watching football bit will be waiting for me to post something in my thread on a Sunday.
If those 2 are true, then I shall get the help I need in identifying a leak, i.e., a rear pinion seal leak. Making sure my rig was road worthy to go to Michigan yesterday, I laid under to check things out before hitting the road. I saw a bunch of fluid all over the axle housing, tub above, and gas tank and skid and immediately thought brake fluid from the distribution block. Stuck my finger in it like the nosey head first person I am and not brake fluid (too thick). I checked my levels anyway--still full and brakes feel fine. Had wife stand on them a couple times while i inspected underneath for good measure. Still fine.
So, only other fluids in that location are diff and shock. Checked my diff breather to see if it spit it out. Maybe. Checked diff cover. Nope. All bolts tight and not coming from mating surface of pumpkin or any of the 3 plugs.
So I cleaned everything off good and took it for a test drive. No signs of fluid. We then went to Michigan. Checked on each stop we made and still no signs until last stop near Detroit. Fluid again. We left last night and came home.
I cleaned off everything good again this afternoon and have been taking it out on the highway for short tests while working on "other" adjustments. I am now seeing fluid spattered a bit in the same places and can see it around the pinion seal. I caught it before it saturated everything back there and hid its origin. Silver lining is all the gear oil will work as an excellent rust prohibitor.
On a brighter note, no shimmy anymore when I hit "the bump." Going to unbind my UCAs and continue the quest for a solution to the DW and not a work around.