Drained my transmission of the cheap fluid I was using to flush out the crap before putting in the expensive Mobil1 Full Synthetic ATF. Managed to get right around 7 qts out through the pan and cooler line, so it's pretty much all new Mobil1 full synth in there now. So far my shifts feel a lot better. I ran about 3000 miles on the stuff I put in as a stop-gap fix before and she came out good and clean, which is a promising sign. I'll probably do another flush/fill when I hit 100,000, depending on the condition of the fluid. I'm at 86,000 now and trying to get the max life out of this transmission after it looks like the last change interval was missed by the previous owner.
....7qts... iirc we only need 4..?