I did a Google search and found some patches you can use in the kernel to get 4GB+ files from samba.(Particulary the smbfs-2.4.16-lfs.patch) http://www.hojdpunkten.ac.se/054/samba/
Great link, thanks! I will give it a try. Hopefully patching the kernel will solve the problem. I thought this 2GB file limit thingy was a thing of the distant past...