I've seen the great lakes one in action and everyone I've seen leaks. There is guy named Kurt that is working on one with an O-ring it to cure this. He doesn't have it on his web site yet but check it out.
I put a thick coat of RTV on the ring, then to the t-case, locktighted the studs in and put RTV on the mounting bolts to the t-case. Then a coat on the tranny anf filled in the non used clocking holes. Thing doesn't leak a drop.
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