How to test a Transfer Case Pump

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Any ideas how I can test the working condition of my transfer case pump on my 98 Expedition 5.4 BW4406?
I have the case disassembled, so just want to make sure that the pump is and will do its job after I rebuild and re-install it.
 
I saw a lot of views, but no replies. I just want to test that the pump is working before reassemling the case and puting the transfer case back in the truck.
I was getting a grind noise after the transfer case heated up, and on deceleration loads and when going over bumps but all the internals "look" good. Was thinking is it possible that maybe the pump is not getting oil where it needs to be, causing a bearing to heat up?
 
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