In 1973, Clark, now Dana Spicer Clark-Hurth a global leader in aftermarket drivetrain parts, chose Hydro-Mechanical Systems (HMS) as one of two prime Authorized Off-Highway Service Centers in the world. For over forty years, HMS has helped thousands of Dana Spicer powertrain systems outlast their warranties through its commitment to a plentiful and diverse inventory, superior engineering, technical expertise, mechanical expertise and customer service that's best in class.