After I figured up how derpy I was being, I added the Curtis valve in the right spot, in front of your tire, not the rear diff, and it makes total sense.
After I did everything including the "drain mode" I was able to get 3.7qts. Take it from me and I did everything wrong, but once I figured it out, I can see how the Youtube videos only take the oil change 10 mins instead of two evenings. I haven't done my next oil change yet, but I put the hose on and it should be a no muss no fuss deal.
There are folks on here that have it down, but the 24" flex funnel is a must, I bought a 18" but got things done.
Curtis an aircraft company and the valve is high quality and I do have faith in it.
Listen to the others and take advantage of their years of knowledge.
Just my 2 cents