here are some links to what u might be looking for:

http://forums.nasioc.com/forums/showthread.php?t=518336&highlight=gc8+6speed

http://forums.nasioc.com/forums/showthread.php?t=489950&page=2&pp=50&highlight=gc8+6speed

http://forums.nasioc.com/forums/showthread.php?t=424723&highlight=gc8+6speed

ooo that would be a nice upgrade, I say go for it. :D