That was an interesting video. He looks to be intimately familiar with transmissions. There were comments related to the video - either from the guy doing the work or the owner of the car. Something about he lost 3rd/4th gear because it wasn't shifting right and possibly burnt a clutch. He was asking for help.
Could there be a problem with contaminates getting into the rebuild. Hopefully the right parts were used. Regardless it was educational.
Member of the Dropped Valve Seat Club.
Replaced #4 Piston, Rings, Rod+Bearings, AERA Re-Manufactured Cylinder Head and a light Hone. Then CLEANED the hell out of everything.