Originally Posted by ellissti6
i know this may seem like a dumb question but has anyone ever thought if 6 speed gears could work in a 5 speed box? if that even possible given the size of the shaft etc, i mean putting top speed aside and not installing 6th gear is that possible?
That would be impossible. The 6 speed is not even loosely based off of the 5 speed. The 6 speed is actually based off of a Porsche transmission. From what I have read Porsche and Subaru got together to design the new STi 6 speed. Every aspect of the transmission is different aside from a few seals and such, but they have more to do with the diffs anyways. Plus if it was even possible you are taking away one of, if not the most important, thing that makes the 6 speed stronger, the case. The main part of the 6 speed case almost looks like a pipe, with reinforcement ribbing on the sides, and iron plates on the ends that house the bearings supporting the gear set.