the axles i made with some 5/16 cold rolled steel rod and used the xtm diff cups or the part that connects them and i used the xtm dogbones from the mammoth st.
http://www.hobbypeople.net/gallery/149317.asp this is the u part the output joint 8mm
not sure of the dogbones either these
http://www.hobbypeople.net/gallery/149791.asp
or these
http://www.hobbypeople.net/gallery/149883.asp
i think its the second one because i remember them being silver