Coan Automatic Transmission Assembly

Coan Engineering Automatic Transmission Assemblies: Race-Proven, American-Made

When it comes to automatic transmission assemblies built for serious performance, few names carry more weight in the racing world than Coan Engineering. Founded in 1976 by Dave Coan out of a small garage in Kokomo, Indiana, the company set out with a singular mission: to deliver a better, more refined automatic transmission to the drag racing community. Nearly five decades later, that mission hasn't wavered — and Coan's complete transmission assemblies remain a benchmark by which others are measured.

What Makes Coan Transmission Assemblies Stand Out

Coan's automatic transmission assemblies aren't just rebuilt stock units — they are purpose-engineered for the demands of high-horsepower applications. Coan Engineering designs and manufactures transmissions specifically for drag racing, circle track racing, off-road racing, monster truck, and street performance markets, meaning every assembly is conceived with real-world race conditions in mind.

One of Coan's most recognized achievements is the role it played in pioneering the transbrake for Powerglide, TH400, and TH350-based transmissions — now considered a standard feature in the racing industry. Their complete assemblies leverage this deep institutional knowledge, incorporating precise valve body work, upgraded internals, and race-validated gear ratios into every unit.

• Coan 3-Speed Assembly: Designed specifically for Competition Eliminator, Super Stock, and Stock Eliminator applications, this transmission features CNC-machined aluminum components and lightweight rotating assemblies that keep weight down without sacrificing durability.
• Competition Powerglide Assembly: Coan's class-competition Powerglide builds are a staple of bracket and class racing, offering consistent, repeatable shifts and the strength to handle extreme power levels.
• Street Performance Assemblies: Built on the same foundation as their race units, Coan's street-oriented automatic transmission assemblies are fully driveable on the street while delivering the shift quality and longevity enthusiasts expect.

Built with Precision, Tested Before It Ships

Every Coan transmission assembly benefits from a manufacturing process rooted in exacting standards. Components are produced using state-of-the-art CAD/CAM design software and CNC turning and machining centers to ensure tight tolerances throughout. Critically, each Coan Racing transmission is dyno tested prior to shipment to verify proper operation — a quality control step that gives racers confidence before the unit ever hits the track.

Coan also maintains one of the most extensive on-track testing programs in the industry, with company-employed licensed drag racers and dirt track competitors actively refining products alongside a network of racers across the country. The result is a transmission assembly that reflects real feedback from real racing environments.

A Legacy Proven at the Top Level

The proof is in the record books. National and Divisional champions competing under NHRA, IHRA, NMCA, and NMRO sanction have all relied on Coan-built transmissions to reach the winner's circle. That pedigree translates directly into the complete transmission assemblies available here — units built with the same materials, tolerances, and philosophies that have earned championships at the sport's highest levels.

Whether you're building a bracket car, a class competitor, or a high-powered street machine, browse the full selection of Coan automatic transmission assemblies to find the right unit for your combination.