Cisco 3750X/3750G stack upgrade

Here's the command to upgrade a Cisco Switch stack that is mixed with 3750X switches and 3750G switches:

switch#archive download-sw /allow-feature-upgrade /overwrite 

tftp://<address>/c3750e-universalk9-tar.122-55.SE.tar 

tftp://<address>/c3750-ipservicesk9-tar.122-55.SE.tar

The /allow-feature-upgrade allows you to bypass the new sanity check from 

Cisco if you're trying to change from ipbase to ipservices.

NOTE:  The universal IOS won't work on the 3750Gs