Explore high-quality racing components, made in the USA by DMI and Bulldog Rears, part of Diversified Machine, Inc. Find top-quality driveline components and parts manufactured for short track sprint racing. Diversified Machine Inc. began in a two-car garage in Lancaster, PA, but expanded when the company started making parts for the sprint car racing industry. DMI focuses on creating high-quality racing parts and components at fair prices, while Bulldog's innovative concepts have greatly improved quick change rear ends. When you need parts for your race car repair or rebuild, trust Diversified Machine Inc. to get the job done.