Thanks lifter01! I had to go buy another 2 gallons (of Super Tech Heavy Duty Tractor Hydraulic and Transmission Fluid - Walmart) and the 1-1/2 socket, but successfully changed the transmission fluid 3 times to get it to be mostly not red. I still have 1 gallon left and will try a 4th change. The screen filter wasn't clogged but did have some small black chips. I can now move forward but forward lacks power (cannot go up a slight incline)...hoping this is a sign of a blown o-ring or something instead of a frozen clutch pack. I forgot to mention, I pressure tested all the valve body ports and they are within spec I also checked the 3 other ports on the transmission itself and they are also withing spec. Thoughts on what to do next?