Another TCI trans problem

I got my car on the road at the same time as buying new house. So I fired up the car for 1st drive which was to move it to new garage. Approx 7 mile drive, during last mile I experienced slipping and weird noises. Got home to discover fluid was burnt up. Drained it, refilled to find that 1st seems to engage, but reverse barely unless reved up a lot. Aren't they on the same band, makes no sense. I am running a cooler plus running it thru the rad, I cracked a fitting to confirm that there was fluid. Lost a pint or more in a minute.
Trans will have to come out. Any thoughts on what to look for. Any recommendation for good place to order parts for rebuild that ship quick?