do i need to reinstall

[jrrelay at juno.com]

i recently bought a new and larger hard drive for my computer.  i put it 
the machine as '/dev/ad3'.  while educating myself about this new drive,
i installed freebsd 5.3 on one of the  slices. i am ready to eliminate
the old 'ad0' and want to move the new drive so it will become
'/dev/ad0'.  will BSD operate in its new location without any changes to
the configuration files?  perhaps '/etc/fstab',  and what else? or should
i just reinstall freebsd after i have reconfigured the machine?
jrrelay at juno.com