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  How many times have you read or heard that a part has been “heat treated?” Whether you’re talking about pushrods, valvetrain components, chassis parts, or even lug nuts, heat treating is often served up as an important selling point on certain products. But is it really that important? According to the chassis experts at

Got questions? We’ve got the answers—the Summit Racing tech department tackles your automotive-related conundrums. This week, we’re looking at posi- and non-positraction rear-end setups. T.J. • Columbia, SC Q: I’d like to know how to identify positive or non-positive traction configuration on Ford and Chevy rear-ends. Is there a quick way to tell? Can you