Pratt Miller

Pratt Miller, formerly known as Pratt & Miller, is an American engineering, product-development, motorsports, defense, and advanced-mobility company headquartered in New Hudson, Michigan. Gary Pratt and Jim Miller founded the business in 1989. It initially established its reputation through high-performance automotive engineering and competition programs, becoming especially closely associated with General Motors and Chevrolet racing activities. The company’s motorsports work has extended across sports-car racing, NASCAR, IndyCar, and other professional series. Its best-known relationship is with Corvette Racing, for which Pratt Miller has provided engineering, race operations, vehicle development, and technical leadership. The partnership helped make Pratt Miller a central participant in the development and competition history of Chevrolet Corvette racing cars, including the C5-R, C6.R, C7.R, C8.R, and Corvette Z06 GT3.R. The company has also supported Cadillac and other General Motors programs, contributed to Chevrolet IndyCar aerodynamic development, and supplied engineering support to Chevrolet NASCAR teams. Pratt Miller’s engineering portfolio includes the design, construction, preparation, and support of race cars; vehicle dynamics and aerodynamics; simulation; rapid prototyping; electrification; connected-vehicle systems; artificial intelligence; and autonomous-driving technologies. Its mobility activities serve customers in areas such as high-performance vehicles, commercial trucking, agriculture, powersports, and emerging mobility. A driver-in-the-loop simulator and related testing capabilities allow engineers to evaluate vehicle behavior and performance before or alongside physical-track development. The company entered defense technology in 2013. Pratt Miller Defense applies methods developed in motorsports—including lightweighting, systems integration, rapid development, survivability engineering, and field-oriented testing—to military products and programs. Its defense work includes robotic platforms, autonomous vehicles, and live-fire training systems. This expansion broadened Pratt Miller beyond competition and commercial vehicle engineering into military mobility and advanced systems development. Oshkosh Corporation acquired Pratt Miller in 2020. Following the acquisition, Pratt Miller continued operating as a specialized engineering organization while expanding its role across Oshkosh’s defense, mobility, and technology activities. The company is organized around motorsports, defense, and mobility capabilities rather than functioning only as a racing team. In 2024, Pratt Miller Motorsports began competing independently in selected IMSA SportsCar Championship categories while continuing its wider technical and manufacturing relationship with General Motors. The motorsports division competes with the Oreca 07 in LMP2 and the Chevrolet Corvette Z06 GT3.R in GTD Pro-related competition. Pratt Miller also holds an FIA constructor license for the Corvette Z06 GT3.R and builds customer racing cars for worldwide competition. Its identity therefore combines a specialized engineering contractor, a race-team operator, a vehicle constructor, and a technology developer.

Pratt Miller was founded in 1989 by Gary Pratt and Jim Miller as a high-performance automotive engineering company. The business developed its early reputation through race-car design, construction, preparation, and technical support. One of its early notable projects was the Intrepid RM-1 GTP car, built in 1991. During the 1990s and 2000s, Pratt Miller became increasingly associated with General Motors motorsports. Its work covered Chevrolet, Cadillac, and Pontiac programs across several categories. The company developed and supported vehicles for sports-car racing, Trans-Am, Grand-Am, the American Le Mans Series, the IMSA SportsCar Championship, the FIA World Endurance Championship, NASCAR, and IndyCar. Its Corvette Racing relationship became the company’s most prominent public program. Pratt Miller provided technical and operational support for successive Corvette competition cars, including the C5-R, C6.R, C7.R, and C8.R. The company’s vehicle-development work also extended beyond race teams. It developed the C6RS, a road-going tuned version of the Chevrolet Corvette C6. The project used a large-displacement LS-based engine developed and built by Katech. Pratt Miller also expanded into Cadillac racing programs, Chevrolet NASCAR engineering, and Chevrolet IndyCar aerodynamic development. Its work on Chevrolet aero kits contributed to the manufacturer’s participation in the series. Pratt Miller established a defense division in 2013. This marked a strategic expansion from motorsports and commercial automotive engineering into military technology. Pratt Miller Defense developed robotic systems, autonomous vehicles, and live-fire training solutions, using the company’s existing experience with lightweight structures, vehicle dynamics, rapid prototyping, integrated electronics, and demanding test environments. The company later developed a broader mobility practice. Pratt Miller Mobility works on high-performance vehicles, commercial trucks, agriculture, powersports, electrification, artificial intelligence, connected vehicles, autonomous systems, and prototype development. Simulation, including driver-in-the-loop testing, became part of the company’s engineering toolkit. Oshkosh Corporation acquired Pratt Miller in 2020. The acquisition placed Pratt Miller within a major commercial and defense vehicle group while preserving its specialist engineering role. The company continued to operate across motorsports, defense, and mobility rather than being limited to a single racing program. In 2024, Pratt Miller Motorsports began competing independently in the IMSA SportsCar Championship. Its programs included the Oreca 07 in LMP2 and the Chevrolet Corvette Z06 GT3.R in GTD Pro-related competition. Pratt Miller also held an FIA constructor license to build Corvette Z06 GT3.R customer cars, extending its role from team engineering and race operations into customer-car construction. Across its history, the company has remained defined by the transfer of competition-grade engineering practices into professional racing, defense technology, and advanced vehicle development.

• 2024

  Independent Pratt Miller Motorsports programs begin

  [1]Pratt Milleren.wikipedia.org

  The motorsports division begins independent IMSA competition in LMP2 and GTD Pro-related programs.

• 2020

  Acquisition by Oshkosh Corporation

  [1]Pratt Milleren.wikipedia.org

  Oshkosh Corporation acquires Pratt Miller and integrates its engineering capabilities into a broader commercial and defense vehicle group.

• 2013

  Defense division is established

  [1]Pratt Milleren.wikipedia.org

  Pratt Miller expands into defense technology, including robotic platforms, autonomous vehicles, and training systems.

• 1991

  Intrepid RM-1 GTP is built

  [1]Pratt Milleren.wikipedia.org

  The Intrepid RM-1 becomes one of the company’s early major vehicle projects.

• 1989

  Pratt & Miller is founded

  [1]Pratt Milleren.wikipedia.org

  Gary Pratt and Jim Miller establish the company as a high-performance automotive engineering business.

A specialist engineering and technology partner that transfers motorsports-derived capabilities in vehicle performance, rapid development, lightweighting, simulation, autonomy, and systems integration into commercial mobility and defense applications.

• Prototype race car · 1991

  Intrepid RM-1 GTP

  The Intrepid RM-1 was an early prototype racing car associated with Pratt Miller’s formative period. Built in 1991, it demonstrated the company’s initial capabilities in race-car design, construction, and high-performance systems integration.

• Sports-car racing vehicle

  Chevrolet Corvette C5-R

  The C5-R was one of the Corvette competition platforms developed and supported through Pratt Miller’s General Motors motorsports relationship. It formed part of the company’s long-running Corvette Racing engineering and operations portfolio.

• Sports-car racing vehicle

  Chevrolet Corvette C6.R

  The C6.R extended Pratt Miller’s Corvette Racing work into later GT racing regulations and endurance competition. The program covered multiple competition specifications, including GT1 and GT2/LM GTE configurations.

• Sports-car racing vehicle

  Chevrolet Corvette C7.R

  The C7.R was a Pratt Miller-supported Corvette racing platform used in IMSA GTLM and international LM GTE competition. It represented a further development of the company’s engineering and race-operations role for Chevrolet.

• Sports-car racing vehicle

  Chevrolet Corvette C8.R

  The C8.R is a mid-engine Corvette competition car associated with Pratt Miller’s Corvette Racing programs. It has competed in IMSA GTLM and GTD Pro contexts as well as LM GTE-related international racing.

• Customer GT3 race car · 2024

  Chevrolet Corvette Z06 GT3.R

  The Corvette Z06 GT3.R is a customer-focused GT3 competition car built under Pratt Miller’s FIA constructor license. Pratt Miller manufactures the cars for teams competing in series including IMSA, LM GT3, and GT World Challenge America.

• Road-going performance vehicle

  C6RS

  The C6RS is a road-going, tuned version of the Chevrolet Corvette C6 developed by Pratt Miller. Its LS-based 500-cubic-inch engine was developed and built by Katech.

• Defense technology · 2013

  Defense robotic and autonomous systems

  Pratt Miller Defense develops military technology based on robotics, autonomy, vehicle engineering, survivability, lightweighting, and rapid prototyping. The portfolio includes robotic platforms, autonomous vehicles, and systems used in live-fire training environments.

• 2024

  Independent motorsports expansionStrategy

  Background

  After decades of providing engineering and operational support to manufacturer programs, Pratt Miller sought a more direct competition role for its motorsports division.

  Action taken

  Pratt Miller Motorsports began independent IMSA competition in LMP2 and GTD Pro-related programs while continuing its Corvette-related technical and manufacturing work.

  Aftermath

  The division combined independent team participation with construction of Corvette Z06 GT3.R customer cars under an FIA constructor license.

  Source

• 2020

  Acquisition by Oshkosh CorporationM&A

  Background

  Pratt Miller had developed a diversified engineering profile spanning motorsports, commercial vehicle development, and defense systems.

  Action taken

  Oshkosh Corporation acquired Pratt Miller.

  Aftermath

  Pratt Miller continued as a specialist engineering organization within Oshkosh’s broader commercial and defense vehicle activities.

  Source

• 2013

  Expansion into defense technologyStrategy

  Background

  Pratt Miller’s core capabilities had been developed in motorsports and high-performance automotive engineering, but those capabilities were also applicable to military mobility, autonomy, and rapid systems development.

  Action taken

  The company created a defense division focused on robotic platforms, autonomous vehicles, and live-fire training systems.

  Aftermath

  The move broadened Pratt Miller into military technology and established defense as one of its principal business areas.

  Source

1. 1Pratt Milleren.wikipedia.org