Basically i bought a non running 4x4 envoy. The transmission needs rebuilt so i started working on it then was curious as too where the quarts and quarts of oil all over the bottom of the engine came from. Found a tiny hole in the bottom of the front differential that i have no doubt is what squirted oil everywhere. My question is what might’ve caused this? Simply overheating or external causes? And by extension what are the chances i can just jbweld the hole and fill er back up with oil and have it work? Dont really want to replace it but i suppose ill have too with no other options. Thanks all!