There is an air bleed procedure for the diff fluid change in the Pilot which has the same components. Its easy to do. If I remember correctly you dont fully tighten the fill hole after draining and filling. Start the Pilot and let it run for a minute or two in park. The fluid pumps will circulate and dissipate any air bubbles. Once it runs for a minute, switch off the car, top off the fluid again and tighten fill plug to spec. I am guessing this applies to the Passport also but who knows.
