I have a friend with a 69 GTO that we dropped a built 455 into with 3:55 posi rear and he runs the Saginaw with no problems and we have beat the daylights out of that thing for years. I am also putting a 455 in my firebird with original 4 speed muncie from his GTO that I rebuilt this past winter and I intend on running 3:73 posi. I would say both trannies have their advantages but Saginaw would take the flag because it does not have Aluminum ears to bust off when beat to death. Just my opinion!! Like he said above...it's how you intend to drive it.
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