alan boyer
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Most transmission gears are case hardened cast. I have dealt with many broken and chipped ones. Some gears are steel, I'm guessing 4140. Main shafts, the shafts the gears slide onto are normally good solid steel. the shafts that the shifter/slider forks ride on are good stuff as well.
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You are dealing with a sway bar. Spring steel for sure. The same goes for torsion bars. I have been a mechanic for too long. I have been collecting this stuff for years. German and Asian cars seem to produce better/cleaner steel. Some of the is just plain crazy, you beat away on it for days and get nowhere. Cylinder head bolts out of newer vehicles are real neat. They are made of some exotic slight spring steel. They referred to as stretch yield bolts. The get thrown out after each use. I have buckets of them. They make great punches. Caution, stay away from intake and exhaust valves, some are filled with sodium, bad corrosive stuff.