Transmission gear questions

[dtowndiesel]

I have a transmission that blew second gear, but before it blew it created so much heat that it turned the mainshaft, 5th gear and the 3rd & 4th combination gear blue. I'm not familiar with steel properties so I am wondering if once a gear has been blued is it junk? I was told by a local machine shop that if the gears are case hardened and they wont be able to release any carbon, therefore not becoming soft or brittle? I'm just looking for a second opinion, any help is appreciated. Thanks

[jcs003]

the issue is how hot did they get? you will never know. if the molecular structure of the gears was changed they can be retreated with heating and cooling procedures. i would suggest getting hi-strength gears and replacing them all while you have it apart.

[Honda 250r 001]

no man dont even chance it. your gonna have fun pulling it down again and replacing them. if you have anything bigger than a 300 i would get stronger counter shaft gears.