2002 Z71 Transfer Case or Front Diff Issue ?

jss0271q

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I have recently acquired a 2002 Silverado Z1. When accelerating around 25-30 mph i am getting a noise like something flapping hard or shaking rocks in box. I suspected u-joints since there was play in the joint nearest the transfer case and the front shaft spins constantly. I removed the shaft and drove the vehicle and had not noise at all. Replaced the joints and reinstalled the driveshaft and the noise continues. I also noticed a random popping noise in 4wd only. The yoke on the front diff does have a slight amount of play in it not sure if that could attribute to it or not. So my main question is does this sound like a transfer case or front diff issue ?

Thanks in advance
 

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