Mark 48 torpedoes in a wartime American submarine fleet

What if Mark 48 ADCAP production replaced the Mark 14 line and expanded at its Second World War rate?

American submarine captains would welcome the much more effective weapon, though they could still need multiple torpedoes and hits.

This counterfactual gives American submarines the Mark 48 ADCAP while retaining the historical expansion of Mark 14 production. It promises a major improvement in torpedo effectiveness and considerable relief for submarine captains. Even then, some attacks could require multiple torpedoes and hits.