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J

jack stands

Metal stands with adjustable height to hold a vehicle once it has been jacked up.

jounce

The compression of the suspension system, such as when a wheel hits a speed bump.

journal saddles

Semicircular cuts located at the bottom of the engine block that hold the bearing insert that supports the engine crankshaft.

just-in-time manufacturing

A process in which large-scale parts manufacturers preassemble various parts into unit assemblies, which are then delivered in the correct order to the vehicle manufacturer shortly before assembly, meeting with the specified vehicle at just the right time.