check the u-joints, if any play in the u-joint(s) then replace all the joints in that shaft.
pull the pinion end of the d-shaft off.
check pinion play, should be a minimal amount of play there (~.008" rotational play)
the t-case should have a small amount of play as well, the 30-45 deg you spoke of.
ratcheting lockers will clunk (lockright, aussie,ezlocker) on occasion. mine sounds like i snapped a axle once in a while lol.

85 runner -dual cases, headlight harness, 34" TSL's
86 toy buggy getting sas'ed with a 14 bolt rear - 8.5" 10 bolt front (this will go away when i find a 60)