Tranny and motor are all one unit. I haven't ever seen a bad tranny on a Valk or Gold Wing myself. If the tranny is truly bad, I would just buy a used lower mileage motor and swap them out. I'm not sure, but, I think the motor cases have to be split to get to the trans gears. I would get a service manual and look it over before I did anything. Other members may have more helpful suggestions.
