I'm 99% sure, but couldn't find anything by searching. Is there a difference between the S4 and S5 TurboII transmissions at all? Will they interchange without any problems? Same Q for driveshafts.

Also, the TurboII driveshaft is aluminum isn't it?

 

i know that the trannys are the same except for the 5th gear gearing between them. s4 has shorter 5th. while s5 has longer 5th