A few years ago my company submitted our domain (sewelld.com) to
google as well as a myriad of other engines. I have been able to go
resubmit our new primary domian (sewelldev.com), but cannot seem to
get google to index the new domain as opposed to the old. They are
both pointing to the same IP address so google seems to ignore any
request to index the page based on the fact that it already has a page
indexed (the older domain) - how can I change the domain that is
indexed by google to our new domain name? (sewelldev.com)

Hi there!

It appears the problem lies with people still linking to your old URL:

"If we continue to list an 'old' version of your site (i.e. we
continue to list www.my123site.org despite the fact that your site now
lives at www.my456site.org ) you need to update the links that are
pointing to the sites. Since our robots jump from page to page via
hyperlinks, someone must still be linking to the defunct page. Once
others correct their links, we can too. Once your new site is live,
you may wish to place a permanent redirect (using a "301" code in HTTP
headers) on your old site to inform visitors and search engines that
your site has moved.

One way to determine who is linking to the dead site is to try a link
search. You can find instructions on how to do this on our features
page. Please note that this process does not work for all of the sites
in our index."

Google Information For Webmasters - You continue listing an 'old'
version of my site.
://www.google.com/webmasters/3.html

You can do a link search here:

Link Search
://www.google.com/help/features.html#link

...to determine who is linking to the old URL.  Simply contact the
webmasters of each site still linking to the old URL, and ask them to
update their pointers.  Google will automatically pick up the changes
the next time those sites are spidered.

Good luck!

--Missy

Search terms:  None.  Pulled Google Information for Webmasters.

This was very helpful and saved me hours of research. Thank you.