Upgrade Hard Drive - hda

Hi all, I currently have a 9.3 box with 3 drives installed, hda (windows98), hdb (suse 9.1) and sda (suse 9.3) which is my default and almost always used boot. I want to ditch the hda drive, and either add a new drive in its place, or just use the current hdb drive. Three questions. 1. What is the best / easiest way to move or copy my current grub from the current hda to the new drive? 2. If I use my existing hdb, do I need to configure it to hda, or will it work as is? 3. Can I add another SATA drive (the sda is a SATA) and do away with the 2 IDE drives altogether? Many thanks, Jim F