Well Von if the leak is coming out of the front past the converter, the areas of concern are
Front pump Seal
Pump Bushing
Converter hub
Pump Gasket
Pump O Ring
The converter hub must be mirror smooth, no groves, no nicks.
The same holds true for the bushing in the pump the converter hub rides on.
Always pack the back side of the pump seal with vaseoline. This helps prevent the garter spring in the seal from popping out.
A good general rule of thumb is any time you replace the pump seal, also replace the pump gasket and the pump O Ring.
Good luck.
Graham