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Thanks Picone! Will do. I appreciate everyones help.

Thanks to all for the help! MetalGuy, What would you suggest I do from this point. Just how brittle is this cage with no HT?

This axle is not the "banjo" type. Its a Dana 70 with a cast pumpkin. How can I mig weld to this casting correctly?

Hey Picone, thanks for the info. Im trying to find out how critical the post heat treatment is to the strength of the cage. Will this be extremly brittle by not HT the HAZ? It will be a bit difficult to maintain 1100 de. for 30 min. for ea. joint, so I want to make sure its something I need to...

Thanks for the reply,Metalguy. How much (weaker)are the HAZ's when post heat treatment is not done? Can I PHT with a torch? What do I need to do this the correct way?

What type of casting is used on a trucks axle differential housing and is it possible to mig weld mild steel to it and have it be very strong?

Ive built a full roll cage in an off-road truck using 4130 1 3/4 x .120 wall tube. This is the first time ive used 4130 as opposed to mild steel. Ive mig welded all joints and everything seems to have come out well. This cage is tied to the frame and will be subjected to a lot of flex...