front pump, had one break the tang's on the gear, this was during use tho.
forward clutch is not engaging and this could be caused by low or lack of pressure and that can be caused by the valve body, front pump, and internal pressure leak, just to name a few,
when you first put fluid in the tranny then started it up did the fluid level drop as if the converter was filling up and lowering the amount in the pan? Also did you do a air check on the systm to ensure the seals are ok, one could of rolled or pinched during installation,,just some thought's