Play/clunk in transfer case

[Chris253]

I can spin the rear drive shaft by hand and make it clunk. The clunk is definitely in the transfer case. There's also a bit of rotational play followed by a clunk when I let it go during the rotation. Seems like there's a clunk in the rear end and a little bit of play followed by the clunk in the case. So basically I'm hearing 2 clunks, one in the transfer case and the other in the rear end one after the other. Gt4 g80 rear end says the codes. Should I rebuild both or is this normal?

 

[Chris253]

"The G80 locker will disengage at about 20 mph and will not lock up again until you drop below 20 mph (use centrifugal force engage/disengage)."

I found this bit of information on another forum and I thought it was interesting because that is about the speed that I get the clunk when driving.. Anyone have an opinion on what I should do?