my bro has a '91 EF9. he has a jdm b16 in it and he blew the trans so he needs a new trans. we have a tranny now. but i dont kno whut it is. it has ysk1 on the side of it. no sticker. the splines on the input shaft dont mesh up with the clutch itsself. can some1 tell me whut kinda of tranny this is and whut i need to do to use this tranny.

thanks