Huh? What needed to be lubed, the piston shafts? Mine are pretty dry but I think they're moving. Definitely not seizing up on me. I never lube them much when I do brake jobs.I feel your pain, I just went thru a similar noise. I replace my hubs, checked the brakes, and wiggled everything etc. I was a little embarrassed when the third trip to the dealer, the shop Forman told me my brakes were dry. That they could do a $49.99 brake service to clean and lube them. Well after the price of 2 new OEM Hubs, I said go ahead I am here. Well 1500 miles later I haven't heard the noise.
U joints were my initial thought as well.sounds like you crushed some needle bearings when you were doing your U-joints if the noise presented directly after replacing.
the best thing you can do is take a video of it while driving so you can further help to pinpoint.
maybe if you have enough jack stands toss it up already in 4wd, do not shift while in the air... then let it in drive and see what happens.