Yes, with my turbo motors I used a T400 with 1st gear locked out and the Park position left in (really helps with 2 things; 1 - prop changing and 2 - warming up or idleing at the dock; in Park it prevents creep). Back in those days, a guy named Dave Zielebra in West Covina developed this transmission for boats (he left first gear in). I was at the Nautical at LHC and I heard the most amazing thing, this guy in a Campbell was racing everyone and blowing their doors off from 0 - 60, and his boat was shifting! I chased him down with my XS and got the details. Since then I've owned at least a dozen boat with auto's, single and dual engine. It will do nothing but improve the performance of you 24 Spectra (along with gobs of horsepower)