GOOD NEWS. . . . The PICTURE UPLOAD FUNCTION IS WORKING !!! The tech folks at the parent company have been able to remedy the issue. You can upload pictures once again. Thank you for your patience.
Upper gearbox should be the similar. The gear ratio change is in the lower. But there are some minor differences in upper gearboxes. Depends what parts you're talking about but it may be better to measure, shim, and swap complete uppers.