This article was updated Jan. 17, 2023. It was originally published Oct. 21, 2004. Using the correct thread is critical for proper mating and replacing hydraulic fittings. First and foremost, it is a ...

Like it or not, Detroit's going metric. New-design engines, chassis, and drivetrains are in most instances entirely metric. Older engines and chassis may have a combination of both standard (English) ...