I'm wondering why you should even transfer -- if your school follows a somewhat traditional curriculum, you should have a number of months for electives which you should be able to do anywhere you please. In fact, my wife and I plan to be rotating in the same areas during our fourth years. She is currently a third year osteopathic student and I'm a third year allopathic student, but we are able to plan out our fourth year such that we are always together even though her school is in Florida, and mine is in Connecticut. You should be able to spend most of your fourth year out west if you schedule your elective rotations out there without having to go through the hassle of transfering. Find out how much elective time you have at your school and schedule accordingly. Hope this helps.