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Recent technological advances in electronics have strongly affected the medium and heavy duty truck industries. Modern truck engines supply much higher torques over a wider range of rotational speeds than their predecessors of just a few years ago. Drivetrains with “new generation” engines and “old generation” clutches most often have resonances that are spread over the entire operating range. Consequently, these powertrains experience large torsional oscillations accompanied by considerable dynamic overloads. This implies a special responsibility binding clutch manufacturers. New clutches must not only have higher torque capacities, much lower damper rates and longer working travels, but they also must be packaged in the very limited environment allowed by the old designs. Newly redesigned LTD discs produced by the Meritor Clutch Company meet these new demands. As a modular product the LTD disc has been designed to comply with today's rigorous dynamic requirements.