A torque converter, flex plate question, and install question..
as said..make sure the converter is seated on the pump ...if not the converter will not engage the pump and the trans will have to come out again...
the converter should drop like twice onto the splines...and once the converter is seated in the pump ...if you move the converter back n forth you should hear a clak..clak noise...that will be the slots on the converter hitting the pump gear....