How To: 5-Speed Transmission & Transfer Case Fluid Change
#18
ACD uses Diamond ATF (automatic transmission fluid). I don't think the system needs to be bled for a normal fluid change because you actually only drain the fluid from the rear differential AYC torque transfer mechansism (about 0.55 quarts). I don't think there is a procedure to drain the whole ACD system (which uses 7 quarts ATF). Maybe you only drain the whole system if you replace the ACD?
#22
This guide is correct, and you can change the fluid just like you would change your oil. It should not be necessary to bleed the system if you are just replacing fluids.
#23
There is no bleeding involved when changing the transfer case fluid. I have asked a Mitsubishi Tech, the tech replied the bleeding is for the ACD. It's a simple DIY when changing the gear oil.