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The oil may not have gotten as far back as the torque converter but it would be wet on the backside of the flexplate if the rear seal is leaking.The first thing you need to do is find the source of the leak,then you can go about fixing it. I am going to send you a link that explains using a dye to find leaks. I don't believe you have to go this far to find most leaks,just cleaning the area using some Gunk engine cleaner,followed by a water flush,or brake cleaner and compressed air is usually sufficient in most cases.