Is there a private pack with Unleashed and Gregtech?
you can do that yourself with only a few block ID tweaks.
Actually, because this is such a common request, with unleashed 1.1.3 at least, you can insert Gregtech directly into the pack no config changes at all. The server I play on currently has done this
What we did was just download unleashed, then download unhinged, and grab the greg-tech version from unhinged to load into your unleashed and you'll be good.