1356 Doubler, It's like Bigfoot

[Doug Krebs]

I think the stub shaft is the hard thing to do here, I just can't figure out why more people don't send it off to Moser and be done with it.

I agree that it's easy to send it off and have it done. I guess my point was, do they heat treat the shaft again? I don't see how there will be any strength without it unless the 1356 shaft is heat treated differently than mine.

[KrazyKarl02]

I agree that it's easy to send it off and have it done. I guess my point was, do they heat treat the shaft again? I don't see how there will be any strength without it unless the 1356 shaft is heat treated differently than mine.

I guess what guys like D.D. Machine do is cut the shaft then re-heat treat it? I know he had an option where you could send in your current shaft and he would cut it down.

Side note, Scott had an axle shaft resplined by Moser. I don't think it was heat treated after the machining and I am guessing it is still working. So why would that work and not this? Is it because you have to take too much material off and get out of the outside hardened area?

[redcagepatrol]

I guess what guys like D.D. Machine do is cut the shaft then re-heat treat it? I know he had an option where you could send in your current shaft and he would cut it down.

Side note, Scott had an axle shaft resplined by Moser. I don't think it was heat treated after the machining and I am guessing it is still working. So why would that work and not this? Is it because you have to take too much material off and get out of the outside hardened area?

so I just looked at this thread...

there is only like one company that heat treats after machining and only one that rolls the splines. If you read the "sales pitch" on Moser or some of the other custom axle guys, cut threads sound just fine.

Actually - all new shafts from Moser and Currie (amung others) are cut after heat treating.

[KrazyKarl02]

Actually - all new shafts from Moser and Currie (amung others) are cut after heat treating.

I think the issue is that when you respline one of these shafts you cut over 0.050 off the diameter. From waht I have read the heat treating results in a surface hardness that is only about .015 thick, so in effect you would cut away much of the surface hardness.

On a different thought, if you think of how the gear reduction works (and I am probably stating the obvious here), the shaft in the rear axle sees much more torque, but less rpm's than the one in the T-case. So if it would hold up in an axle, I think it would hold up in a t-case. I suspect most people's failure with welding and press fit gayness in transfer cases is the result of the higher number cycles that cause fatigue rather than one shock load.