The configs should be in the Unleashed folder so it should be easy to drag and drop. Be sure that you are using the version for 1.5.2, version 3.11 You can get it from
here. In the second post under the spoiler 'Downloadlinks of OLDER versions' or you can download Unhinged and transfer the gregtechmod.zip from there. Be sure that if you make changes to the configs on the client or the server that you make the same changes to the other or copy the configs so they are the same.
Edit: Thanks Ash I forgot what the stance was for GregTech now. I also thought that it was only for the later 1.6.4 packs, but oh well.