(417) 532-8332
Performance and racing engines and transmissions


Using the latest technology and years of professional experience, Richmont Automotive builds and rebuilds transmissions and torque converters for a wide variety of applications, including drag racing, monster truck racing, circle track racing, and street performance.

If you want your rig to go faster, or just to shift again, let our experienced team of professionals get you back in the fast lane.


When it comes to racing transmissions it’s GM or bust. That’s because street transmissions make an excellent foundation for drag race transmissions, and since long before the muscle era GM has dominated the market. In applications that require the ultimate in durability, Powerglides and TH400s have always been the gold standard, but which is best for your application?

Some applications are better suited for a Powerglide, and in others a TH400 is a better choice. For cars that weigh less than 3,200 pounds, launch violently, or are traction limited, the Powerglide is the best choice. In these types of applications, a Powerglide is the ultimate in consistency as well. On the other hand, for cars that will see any street time at all, a TH400 is a better option. In race cars, compared to a Powerglide a TH400 is better suited for cars with large tires and taller rearend gearing. Heavier cars need three speeds to help get them up and running. Another three-speed option is the TH350. It’s not as strong as a TH400 in terms of ultimate strength, but still very popular for most street/strip applications.

Modern TH350s can now survive behind 900-plus horsepower motors, which was unheard of just 10 years ago. Building the perfect drag automatic is a balancing act among durability, efficiency, and low mass.




Richmont Automotive - 137 Brice St Lebanon, Missouri 65536 - (417) 532-8332