If you drain the fluid... adjust the bands!

Just did the regular maintenance on my original 67 727, which started screwing up the 1-2 shifts. When I got the car someone had disengaged the linkage too, no idea how long it was run like that.

Adjusted the bands and the linkage, changed fluid and filter. Installed the smallest Transgo towing shift improver kit with conservative setting (drilled the holes to the medium size they suggested). Have a perfectly shifting transmission.