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Steven Lutz

4340 vs. 4340 - What's in your axle?

Superior Axle does have two versions of chromoly axle shafts, the Discovery Series and the Evolution Series. The Discovery Series is their overseas model which is probably closer to 4140 than 4340, understand that it’s not a 'quality of steel' issue but a 'difference in standards', there is no true "4340" used overseas.  They call it something different and it’s close; but, not exactly the same. The Evolution Series is what we’re after, the good stuff, strong beefy home bred axle shafts made right here in L.A.  Superior’s Evolution Series chromoly axle shafts are made right here in the USA.

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