i have 4/4.5 inch lift in the rear of my '94 limited and i have a transfer case drop, about 20mm, and had no vibes that i was aware of, until that is i went to 4.10 gears, the prop shaft now has to spin faster for the same speed and so the vibes apeared at 110kmph where as they used to still be there, but at a much higher road speed ( which of course i never did)
as stated above you have to try it and see what happens, there seems to be no hard and fast rules
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