Ok, so here's the deal.
Not very happy about the darker fluid because that usually means one of a few things.
Either it was slipping and burned the fluid and at least one of the clutch sets or a band.
It got real hot and just burned the fluid without hurting much (this one is a bit rare)
Or it was neglected and the fluid got like that over time. (kinda common)
If it smells like burned wood with an oil hint it's probably going to need a rebuild.
I blew up this previous pic to give more info so I hope it's viewable.
There are two clutch sets inside drums, and the second gear band is under that front band.
The other is inside that Big bell looking part (the sun gear shell)
Each of the servos are marked with dots to the holes you want to pressurize to activate.
Those four red dots in the holes are the ones to air test.
The two clutchpacks make a thunk type sound with just a little bit of air noise along with it from down inside the trans.
The servos are quieter with less escaping air noise.
You could even adjust the bands if you like before testing but about 1/2 inch freeplay on the rear band is pretty close.
The front band servo pin should pop up about 1/4-3/8 of an inch when hit with air.
You can give the rear sprag a quick diagnosis to see if it probably works by turning the output shaft back and forth.
One direction it should be easier to turn than the other direction and you may even hear a squeaking sound turning it one direction and not the other.
The squeaking sound is a good thing and usually means the sprag is working.
Besides the pump these are the 5 major components that can be tested on the bench and have some degree of confidence that the trans might be ok.
Almost missed ya for tonight, as I just came in to shut the computer down and FABO was still open so I saw your message.
Let me know how it goes.
