PGR Joins 4400 Class with a Miller Chassis

As Proving Grounds Racing (PGR) grows season after season the team is excited to announce the build of the new 4400 class car! With many leading companies building new off-road race cars, the Proving Grounds team has planned the path of their Ultra4 car with the help of Miller Motorsports. The newest edition to the PGR racing fleet will be a Miller Pro Chassis. This chassis has been tried and true through the builds, drivers, and successes, and PGR is ecstatic to continue the team’s success in progressing into the 4400 class with this unlimited Ultra4 chassis build. Since 2015, Proving Grounds Racing has had a long journey in the racing circuits. Starting with the 4570 modified machine comp

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