Ok well i am tired of the lack of predictablility of an open diff in the rain and i am becomeing kind of anxious to get a posi going for this rs. (made a left had turn today being very careful and half way through the car suddenly decided to go sideways, just because of the 1-2nd shift, and it took me almost 10 seconds to go 50ft from a stop barely cracking the throttle) So what should i be replacing while i (the shop) have the thing apart? I am going to go for a 2 series setup (seeing as i can find atleast up to 3.73s in a 2 series carrier) but what else aside from the usual install kit, posi, gears and speedo gears do i need to grab or make sure they install?