727 pump/input shaft change.

I rebuilt a '79 model non lockup 727. I put billet servos, red clutches, red bands, CRT manual valvebody, etc into it. I had a new pump here and decided to use it.

Upon starting it, I have reverse but no forward gears. I compared the '79 pump with a '74 pump I have and noticed a BIG difference. Parts places list a 70-77 pump and a 78 and up non lockup pump. The input shaft in the '79 had 3 metal rings where the '74 trans I have has only 2...

Does anyone know if using and early pump on a late input shaft would cause no 1st, 2nd, and 3rd? But have reverse.

Edit: I'm pulling the trans back out and swapping the correct pump back into it. I hoping that is my only issue.