we were using axles from this guy:
www.driveshaftshop.com
his name is frank rehak, his site sucks *miserably* but he really does know his stuff when it comes to shafts. I was at SEMA with him (we shared a booth, shhh) two years ago and he knew his stuff unbelieveably well.
I noticed he is no longer welding the shafts, he now uses 4340 shafts, that too can be welded. Just give them a call, theyre good guys, tho they are a bit far away. if nothing else, get some advice.
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