3rd member gasket leak

RTV is not for using with a gasket. It is called "gasket maker" because it is used in the place of a gasket. Using RTV on a gasket can cause it to squirm out of shape and slide out from under whatever it is you're trying to seal. Either use the gasket dry, or RTV by itself. I've had the best luck using the high temp red RTV. Those housings get pretty warm. I've never once had RTV leak when I got done.

Also, as @Oldmanmopar said, double check the weld in the bottom center of the housing. They were often pretty crappy.