How does changing the DNS effect my indexing with Google?

A shopping cart company is asking use to change our Godaddy NS information to thier Name Servers. Our current url structure for product pages is http: //www.domain.com /shop/ product html, this shopping cart company wants to change the url structure to http: //www.domain.com /shop/subcategory /product name html.



If we are not happy with thier services, we want to change the dns back to our old server, but if google see's the new URL's and our old server still has the old URLS, will that report a 404 error and drop our rankings? becuase the new url structure does not exist on the old server?



And how long of a delay between changing NS information does it take?
How does changing the DNS effect my indexing with Google?
Changing pages like that will effect your Google ranking. Google will take a month to three months to update. Yahoo takes a little less. If you are going to do this I suggest you make either; a well descriptive 404 page, or create %26quot;We have moved%26quot; pages for all of the old pages, with links to the new page.



I did this once and created individual changed location pages and that helped a lot more than waiting for Google to update.
How does changing the DNS effect my indexing with Google?
JUST TAKE IT EASY AND FORGET ABOUT IT