Converting from nad83 to lat/long and putting in dxf format

I need help producing a dxf file in lat/long
coordinates for a vector file. I can export
to ascii and then transform to lat/long. But
here is where I am finding it a bit difficult
because I am unsure of the header and the format
that the lat/long data should be in.

If I could convert it the v.out.dxf file would
put it in the right format for autocad.

Does anybody out there work with lat/long to help
me with the ascii vector file?

Thanks for any help.

Kym Lenkus
Davidson Laboratory