Originally Posted by unclemat
I was wondering about that, too. How do you know?
Rallispec told me that they can convert 07+ STI tranny to SpecB ratios by using 5-6th gears from JDM STI Forester tranny.
that's correct- and those Forester gears are the ones I have awaiting installation in my '08. The problem with the Legacy spec B gears is that even though they have the same ratios, they use the older narrow keyway. Subaru changed the width of the keyway on the (input? output?) shaft between 06 and 07. Barring other differences, it might
be possible to use the spec B gears on an 04-06 sti, but you definitely can't use them on an '07-08 sti.