'65 A904 Diagnosis Problem

Update: I ordered the sprag kit recommended in post #2. I can find no video on the internet covering the replacement on the 904 (727 only). According to the FSM, with the 904 the heads of six rivets must be:
1) center punched
2) drill rivet head with 3/8" bit (do not cut into transmission case)
3) chisel off the heads of the rivets
4) remove old piece
5) enlarge holes with 17/64" bit
6) clean up chips, install bolts/washers, torque to 100 inch-pounds (not ft-lbs)

If anyone knows of a video specific to this operation on the 904, please post a link. Thank you.