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Crank seal will only leak into bell housing and drip out, if your crank seal was stolen and the bell housing tightly sealed up AND input shaft seal also stolen then yes, it may pressurise your g/box a tad.
If there was no rear main oil seal you would get a big leak that is true. But no pressure as the crankcase is run at a constant depression whilst the engine is running. So air would actually be sucked into the crankcase, then into the turbo via the CD valve.
