posted this on the bottom of an old thread..but thought i might get more info with a new one...<br /><br />can anyone explain the differences in the type a,b,c,d gear housings on a 1990 force 150hp? i know i don't have type a, because the water inlet is different on it.<br /><br />also, can any of them be interchanged? if i have a 'b', which i think i do, can i replace with a 'd'. i will be using the old shafts, gears, etc...i just need a new housing...a broken skeg took a chunk out of the bottom of the old one.