In my Chev. TB there is a pretty good clunk when low engages, lots of lash
in the transfer case and diffs , when low gear is selected all the lash is
taken up with more force because of the additional torque multiplication, I
am not saying it is normal but both my 4x4's did this. If it didn't do it
before have the drivetrain checked out, also the chain in the TC for slop.
i have 99 4WD tahoe and experienced the same problem. while i don't think
there was ever a TSB issued there was communication from GM that many owners
were complaining of a clunk coming from the xfer case. i took mine to a 4x4
shop, he had heard of the problem and fixed it with some "slicker" xfer case
oil. i don't know what he used but it fix the problem. its been 3 years
since and not another clunk.
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