Hi All, I'm definitely late to the party here, but I'm looking to change my ST90 to a four speed. Not interested in adding a manual clutch, just want to keep the semi-auto. So, I just want to get this right...I can drop in a transmission from a S90, SL90 or CL90 into the St90 case and everything should work? Do I also need to change the shift drum assembly as well? Or can I use the original from the ST90? Thanks so much for the help!!
