I wrapped my springs w/ a damp wash rag when I cut them w/ my cheap 4.5" HFT angle grinder fine!! Steam is 212 degrees so go from there about affecting heat treat, imho..
Just keep the old rag good and wet is all.......
Chicane, did you ever check out that proto-type 2-speed '69 Mercury Cougar Eliminator rearend over on Team Camaro?? I want to say Dennis said no problem for you to check it out..
http://www.camaros.net/forums/showth...-speed+rearend
I have money I would invest in to make it to sell!!
pdq67