TOCHIGI, Japan – Japan’s top supplier of drivetrain couplings for 4-wheel-drive and all-wheel-drive vehicles slowly is shifting gears from mechanical to electronic controls. Tochigi Fuji Sangyo K.K., which sold 1.2 million viscous coupling center differentials last year (produced by ViscoDrive Japan, a joint venture with Germany’s GKN Automotive GmbH), has begun putting emphasis on an electromagnetically controlled center differential called EMCD. The unit, which regulates torque by way ...

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