You need to create a 301 redirect from your old domain to your new domain.
The best way is get on that will redirect from old URL of the threads, directly to the new URL of the thread.
Instead of pointing or adding on these domains, I suggest placing a .htaccess in the root to do the work for you.
Next you'll need to start getting backlinks to the new URL.
You're going to take a huge hit when moving things like this, especially in the short term. After a couple months you should return to where it was before. Google has to completely recrawl your site and reindex everything under the new URL, that includes reranking it.
Unless its 100% neccassary to do such a move, I wouldn't recommend it.
|