Not a dig on JGY, I hear they do great work, but 300F in an oven for a day is NOT cryo treating gears.
Do a search, read the abstracts on the technology and you'll see it actually requires a few cycles down into liquid nitrogen gas at around -300F, allowing it to slowly warm to room temp, and doing it again.
The place I found before charges by the pound, you should be able to do it for around $200 or so. If I could find the company that charges by the pound again, it would be more along $100 or so.
http://www.onecryo.com/onecryo/manuf...manmarch98.htm
http://www.gearsolutionsonline.com/a...below0503.html
http://www.sub-zero-cryogenics.com/motopricing.html
http://www.cryoscience.com/drivetrains.htm