If it sounds like gear popping and is not the transmission popping out of gear or out of four wheel drive, then it is probably the following:
If it is popping from the transmission area it is the safety release in the bevel gear case.
If it is from the front differential it is likely the front limited slip axle clutches, they pop just like they will on a pickup if they are not kept serviced with the correct lube.
If some idiot put larger tires on the back or the front, then they pop until they chew up the bevel gear mechanism. Same thing if the tires are more inflated on one end or the other.
If it actually shifts out of four wheel drive or out of high or low range when it pops, then it is likely the transmission linkage or the transmission itself. That normally does not happen unless they are owned or operated by guys that shove them into neutral and go coasting down a hill then shove it back into gear, or if it is shifted on the fly.
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