You can't always trust the numbers on the pad because I have built a bunch of 18 spline transmissions out of big bearing 23 spline cases. I have also put 23 spline gears into an original small bearing 67 HEMI box. shruggy Sometimes you build whatever you have on the shelf.
Gus beer

rear view savoy.jpg

64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60