ere's what i'm thinking......(its not much but hey!) the 6e9 twin 40hp that i'm running on my SLT cat has a gearbox that is 2:1 (2 turns flywheel to 1 turn prop) now i know that some yammy 40's had a 1.85:1 box and that 55 twin box will fit mine, now as that motor and box was designed for all types of boats and wieghts etc surely the gearbox is a compromise for it to work acceptably on most types of craft.
my SLT and me weigh all up at about 400lbs, so i was thinking of changing the box for one of the 1.85 ones, my thing being that it will spin the prop faster resulting in more speed!
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