So, did the changes using a pump purchased from Jegs. Differential worked really well. Pumped everything out. Transfer case, not so much. As Swing said, gears are right inside the level plug. The pump comes with a very small rubber hose and adapter that fished from the front of the car, over brace, thought the small opening towards the rear of car behind gears, allows a decent amount to be removed. Differential, I got around a quart and a 1/4. Took 1 1/2 quarts to fill it.Transfer Case, I got 350 millimeters out (about the same as tipping the car procedure).

First pic is the differential fluid, second pic is the Transfer Case. Replaced with Royal Purple.

Car was not humming or grinding, was pretty darn quiet actually. BUT..... after fluid change the differential is noticeably quieter. Transfer case is a tiny bit quieter as well.

 

Btw, differential plug had virtually no metal filings, Transfer Case looked like it had been chromed, it had so much on it.

 

Jegs pump =

 

My transfer case plug was same as yours, I suspect. Haven't done the differential yet. It's next on my list and the last of the fluids to replace. That pump looks like quite the ticket.

Engine oil, coolant, brake fluid, power steering fluid, transmission, transfer case...all done. Just the differential is left to do.