I have probably watched dozens of torque-flite videos. A lot of differen't ways of doing things. Got a lot of good information. However, I have encountered a problem, that I'm researching now. The piston that goes in the input shaft clutch drum (piston retainer, original part) is too small to fit the 1968-70 clutch drum (piston retainer) I got off of the net. The 27 spine shaft fit just fine.