Axle materials

["Bownes, Robert M. (EXCH)" <RMBOWNES@intermedia.com>]

Since I'm on the subject of building things, I've been thinking about
the rear end of the GT6 Production car I want to build. As I plan on
replacing the rear suspension with something a bit more, uh, predictable
and remove the Rotoflex couplers, it's going to require the fabrication
of some rear axles. The basic design will be very formula fordesque,
with a CV joint at both ends of a splined shaft. 

Question is, what should I have the machine shop use as shaft material?

Thanks!
Bob
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