Factory High Stall Converters

Where can one purchase these random "stamps"?..But try installing a low stall in place of a high stall in a low geared truck...and be prepared to have your head snapped off..Having a trans that operates unsatisfactorily is an irritation; weather it be from a mismatched converter or improper shift points/firmness.
Right! Tell that to that ratty bastid. lol