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Rear clutch housing disassembly looks like this. The springs in there can break as shown in the pressure gear

Is the PTO disengaged? Just to double check. First diagnostics procedure would be to remove the rear driveshaft, depressurize the air in the system. Then spin the output of the transmission and see if you can feel the clunk with spinning. The next step would be to pull the valve...

Yes. The truck has lockers. More than likely you have a broken spring in the rear clutch assembly

That is a broken gear in the main gear section of the interaxle. You need to know which axle is doing it so you can replace it. It is very very pricey to fix. I think around 1000 for just the chunk but you need to lnow which axle. So you will need to Jack it up off the ground and figure...

Make sure the interaxle diff switch is deactivated. Does it sound like this? https://youtu.be/FJ2VF6_VbpU

Post a video of the sound if you can. Pull the floor access panel for a better vantage. More than likely it is the rear roller bearing but a click vs a clunk can be a huge difference