Good morning :-)

I'm building a Tiger Avon based kit car at home and have deviated somewhat from the usual spec. I have changed the old Sierra diff to an RX8 torsen lsd and plan to use mazda engine box.

The kit is based on a Sierra / cortina running gear and therefore I need to machine custom driveshafts to accept a ford CV one end and RX8 the other.

At work I regularly machine halfshafts for vintage racers using EN24T and they have never failed however the diff gears and hubs are driven through a taper not splines as in my own car.

The RX8 shafts are hard so my questions is will EN24T in its toughened state be good enough for the splines or will they likely wear after a while?

My other option is to use something like EN36b and have the shafts case hardened but I'm concerned about warpage unless I grind them and machine the splines after heat treatment but I'm reluctant to do that.

Any help appreciated
Simon

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