PAC Racing Springs www.racingsprings.com +1 866 799 9417 21200 Telegraph Rd, Southfield, MI, 48033, USA PAC Racing Springs www.racingsprings.com +1 866 799 9417 21200 Telegraph Rd, Southfield, MI, 48033, USA PAC Racing Springs is the Racing and Aftermarket Division of the Peterson Spring Company. With more than 10 divisions around the world, Peterson Spring is the largest privately held, family owned Spring Company in the USA. With more than 100 years of operation. Contact Us Facebook page Twitter YouTube Instagram Contact Us Facebook page Twitter YouTube Instagram Latest News Bump Spring Rate Curve Examples