Missing a check ball????

I completely tore the trans about and hopefully found the reason for the soft shifting and no shifting into 3rd gear....... the front clutch pack had about 3/8" of play!!!! I replaced the clutch packs from the new kit and the clearances came out perfectly!!!! So, I'm assuming they tried to rebuild the trans, and put the clutches from the front into the rear drum, and vice versa....... All the rest of the clearances were well within tolerance, so I should have a great shifting transmission when I'm all done!!!! Nothing was burnt or scored when I pulled it apart, so they must have just (kinda) rebuilt it.......