Link Juice Keeper for WordPress
In order to optimize your site for the search engines, you not only need great content and high quality links but also an optimized internal link structure. You wouldn’t want to lose visitors who end up on your 404 error page either. Link Juice Keeper for WordPress can help. It redirects non-existing URLs to the page or post you want.
Link Juice Keeper lets you choose the redirect method to be used (301, 302, or 307). You have the option to enable/disable notifications in the back-end. By using this plugin, you can make sure your visitors always end up on a relevant page. You can download it for free.