I finally got my redline fluid in two days ago. I changed the fluid today. I drained the GL-5 fluid out and then I used some standard ATF to clean out the gear oil. I ran the car a little while at idle, in forward and reverse gears to circulate and mix with any remaining GL-5 fluid. Then I drained that too.
Afterwards I added about 2.5 quarts of Redline MTL. It sort of smells like a gear oil but is thinner, almost like ATF. However it feels much more...oily I guess, slicker than standard ATF.
Now I have noticed that the transmission sounds the same as with the GL-5 fluid, that is to say QUIET!

With the ATF+ 2oz of FM in it it was noisy and sounded like it was grinding away. When I drained the ATF there was a fine metalic sheen to it from hard part wear though it was a new diff so that is going to happen anyway.
Anyway, the fluid is the correct type and so far I still do not hear any noise so I feel really good now.

warmonger