I own a Lexus SC300 with a 2jzgte with a 5spd tranny. i want to get a LSD but was wondering should i get the 5 spd LSD or 6 spd LSD if my future plans is to swap my tranny to 6 spd. I found a shop that will custom my driveshaft to aluminum that will mount up from a 6spd tranny to my stock diff. can some1 give me some advice? Plus is there any difference between the diff's housing that i sould know about?