Did you find the source of the leak or did you wipe it down?

These ILL's are from the MPC -

They will give you an idea of the assembly.

The 1st - MERC 1956/59 MPC -



The 2nd - FORD 1949/59 MPC -

BASIC PART NUMBER -

7A103 - FRT PUMP ASSY
7A108 - CONVERTER STATOR SUPT
7A248 - FRT SEAL
7B258 - FRT PUMP BUSHING
7025 - FRT CASE BUSHING

Hope that simplifies it somewhat.

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Unlike the large O ring which is soft and rubbery, the hub seal is reasonably hard. Unless they come that way it may have been a candidate for a leak.
I took a closer photo of the hub. The seal sits just above that shoulder I reckon. Should there even be a shoulder? Does the surface look ok? The seal looks good and feels good as I slide the hub on but I'll replace it anyway.

Have you checked to see if a redi-sleeve is available?  Otherwise I'd use some crocus cloth on it and hope for the best.

"FREE SAMPLE"

Having dismantled things it would appear that the front pump bushing and converter hub seal were 'old' and maybe at fault - somewhat disappointing after paying for a rebuild. So I've ordered those and a front pump seal and converter cover seal. I also dug deep and ordered a new converter hub. I'm not convinced that mine is particularly worn, but I don't want to pull it all out again. Now I just have to wait for the slow boat to Australia.
Thankyou all for your help. I'll let you know when it all works.
Cheers, Mark

Just an update folks.
I replaced the converter cover seal, hub seal, converter hub, front pump seal and front pump bushing. I'm reasonably convinced that the hub and bushing were at fault as they showed visible wear. Fatsco in NJ were great for all parts. It's all back together and not 1 drip to be seen.
Thank you all for the advice.

Good job! When I inherited my 55 Tbird, everything but the brakes leaked. I hope that's not the case when it's put back together.