my torque converter wont fit my trnsmission

904 TQs won't fit 727's

Some 727s were "lockup" and had a different front shaft setup

http://www.technicalvideos.com/what_year_727.phtml

The "lockup" trans had a smooth spot at the very end of the shaft, the "standard" 727s had the splines go right to the end of the shaft

There may be other differences I'm not aware of