73 E body front disc brakes conversion on A body. Where did I mess up?

Folks may find differing terminology in lots of places. Chrysler calls the input shaft/ clutch gear/ main drive gear in their transmissions a "pinion." If you look through various parts catalogs for other brands of transmissions, such as Clark, Spicer, GM, Ford, etc, you will find these other terms.

Not all steering knuckles/ spindles are one piece, so who says, what is correct?