To my mind, this is one of the most remarkable blogs still going: it covers a broad topic: the technology of the mid-century american automobile and the industrial and economic dynamics that shaped that technology. It does so in such detail, however, that each post is its own little world of fascination to me.
Good places to start:
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A history of the Hydra-Matic automatic transmission, the first successful automatic gearbox. Also, don't miss the follow-up about other GM transmission designs including the ambitious project to get rid of every part of the transmission except for the torque converter.
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The origins and history of the "foxbody mustang"
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Why so many classic coupes look like they are a convertible.
There's just an endless amount of stuff on there, so even though it updates rarely, I'm always finding something I didn't even know I wanted to read.