It is very rare that the transmission case itself leaks.  The transmission is actually four separate sections.  From front to rear:  bell housing, front transmission section, rear transmission section, and shifter extension housing.  The transmission is sealed very well from the factory.  Signs of leakage between the two transmission sections or the shifter extension housing will require a serious remove and repair job.  If the transmission was recently serviced for a rebuild, take it back to the transmission shop and tell them the case is leaking.  If it hasn't been recently rebuilt, be aware that case leaks could be a sign of serious internal transmission damage.

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