I recently purchased a 91 shadow 2.5 turbo auto as a project. It had a blown timing belt. We replaced it this weekend and drove it. The trans doesn't shift that great. We want to change the fluid for sure, but I thought about using some auto rx. I have some from my Dakota that I used it on. Is it the same stuff as the engine?? The website doesn't really specifically say. I don't want to order transmission cleaner and find out it's the same stuff I have. Thanks