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Doubt it’s a crack, it would take major impact.
Get it up on some jack stands and have a nosey. Could be axle seals, pretty obvious. Input shaft seal, will be dripping from where the trans meets the engine, there’s a cut out in the trans casing right underneath. Oil cooler and pipes at the front, likely culprit if you had a prang. Sealant between the casing halves but pretty unlikely. This all assuming it’s auto?