si utiliza la redireccion 301 para transmitir pagerank a tus nuevas paginas no hay ningun problema con google, (segun he leido).
Redireccion PHP
<?
Header( "HTTP/1.1 301 Moved Permanently" );
Header( "Location: http://www.nueva-url.com" );
?>
Redireccion ASP
<%@ Language=VBScript %>
<%
Response.Status="301 Moved Permanently";
Response.AddHeader("Location","http://www.nueva-url.com/");
%>
http://www.webconfs.com/how-to-redirect-a-webpage.php