I have a sub-page address like this www.footwear-shop.com/shoes.php that needs a name change to www.footwear-shop.com/boots.php. The content is identical, I just want to move it to a more correct address. (in this example, obviously the page is really about boots and not about shoes) Do I need to make a 301 redirect for the former - now nonexcisting - page or wil the search engines pick up the new one and delete the old one from their directory without hurting my rankings?