ran into this issue with my best friends 2k Ex...JUST GET A NEW ONE or used one....trannies are not fun to rebuild..and arent cheap..its easier to just swap a new one in and go about your way..and junk..or sell it to a shop or something..you can get a used tranny online for like 1k for a GSR...if not less...B16a2/3 trannies are universal with GSR's you may just need new axle seals, throw out bearing and axles...which you may as well change while u got it all out and apart