Photo courtesy of FCA US.

Photo courtesy of FCA US.

FCA's primary Jeep Grand Cherokee assembly plant in North America has built its 6 millionth vehicle less than three years after building its 5 millionth vehicle, according to the company.

At 8:30 p.m. on May 25, the Jefferson North Assembly Plant reached the milestone by producing a 2016 Jeep Grand Cherokee 75th anniversary edition. The Grand Cherokee Limited 4x4 is powered by the 3.6L Pentastar V-6. The vehicle will be delivered to a customer in Michigan.

Nearly 4,500 people work at the 3-million-square-foot facility on an alternative work schedule, meaning three crews work two 10-hour shifts each day, six days a week. It takes a day and a half for a vehicle to travel from the body shop to when the vehicle rolls off the assembly line.

In 2015, the plant produced 365,542 vehicles. Nearly 25% of the plant's production is shipped to 135 markets around the world.

The plant, which was constructed in 1991, builds the Grand Cherokee, Grand Cherokee SRT, and Dodge Durango.