TRANNY: B18 vs B16

I have a friend who's considering swapping their tranny and they asked me if I knew anything bout the difference in these two trannys. Obviously, I don't, so I posted this thread. So if you know anything bout the differences in these tranny's (gear ratio, etc.) plz post. Just for specifics, we are talking GSR vs. Si...Thanks for any help

I have a friend who's considering swapping their tranny and they asked me if I knew anything bout the difference in these two trannys. Obviously, I don't, so I posted this thread. So if you know anything bout the differences in these tranny's (gear ratio, etc.) plz post. Just for specifics, we are talking GSR vs. Si...Thanks for any help
damn man havent seen you post in a while. anyways the gearing is different. the b16 tranny is slightly shorter geared then the gsr tranny. it depends on what motor youre building but thats the only difference.