727 Leak Inside Bellhousing

Hellrats said

Could be, or you clipped the front pump O-ring when you installed the pump. Also make sure you have good gaskets on all of the front pump bolts.

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I didn't rebuild the trans, but it doesn't mean someone else didn't do just that. It came out of a working car; it is all I know about it. I installed a manual valve body and new front seal, but that is it. I will double check the pump bolts.