Transfer case "click"

91 Z71 has a clicking noise coming from the transfer case on acceleration and deceleration, it goes with the rotation of the drive shaft ( faster you go faster it gets , slower you go slower it gets) not a U joint but
definitely internal. Doesn't seem to effect drivability but it is annoying and leaves you wondering if it's gonna self destruct. Any thought on this guy's?
Thanks in advance, Dave
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I had a 99 Z71 that did the same thing, turned out the xfer case was low on fluid. took it in, had it topped off and it stopped.
--
ABM

Yes, I am angry. :-(
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