Not my area, but I recall diffs causing shaking when they needed to be attended to, fluid etc. Is it possible that you front drive Diff has not been used and the fluid is compromised.
I know and understand the mechanics of the hubs, balls, CV's. These things would be prevalent at all times, not just during 4x4 operation. Balls will cause quick short jerk, hubs will cause bad noises and sloppy steering, CV's will also make funny noises, unless you have seized CV's which would be more than noticeable upon inspection. I would suggest changing the fluid.
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