Not to hijack, but, what is/are causes for pump failure? gear wear or the housing the gears ride in, or both? Anyway to check a pump or pump components (measureing or otherwise) to verify they are good or bad before assembly?
Most common reason for pump failure is incorrect installation of torque converter.
Other than that, the gears, which are the only moving parts in the pump, wear out. Since they cannot go bad without damaging either or both the pump body or stator support, one or both of them are also bad.
Externally, the stator shaft (cast iron) is easy to break.
Internally inside the transmission both the direct and forward drums ride on the drum tower on the back side of the stator plate, and either of those drums can cause damage to the drum tower. Finally the thrust washers/bearings between the pump and drums can wear out causing damage to the pump.
Although possible, the bushings for the input shaft in the pump bore can go bad, but I have never seen that problem.
Eyeball the wear surfaces of the pump. If they are scored (if you feel anything when you run your fingernail across them) the pump needs to be replaced.