Sad Story On a Gear Vendors OD

famous bob said

I wish someone would come up w/ a good overdrive only , no gear splitting, that would handle 7-800 h.p. , not cost an arm and a leg ,
and not take a bunch of crazy assed machine work or use someone elses parts to install. (don't want much , huh !)

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How is Passon Performance accomplishing with their A855 5 speed with .70 5th gear? Ideally I would think you still want to gear 1/4 for 1:1 final gear. And the OD gear is just for that. To knock RPM down for extended use. OD gear was typically weaker. (But I'm sure that has changed with modern trans builds) But it used to be one would never pull a heavy load in high power demand (Let's say up a even slight incline) using an OD gear? Good way to smash your tranny.