The factory was built in 1964 and 1965 in the south part of Belvidere, Illinois, adjacent to
U.S. Route 20. The first production line vehicle was made on July 7, 1965, assembling the new
Chrysler C platform vehicles. Less than 2 years after it opened, the plant was affected by an
F4 tornado on April 21, 1967, which passed nearby. While the plant was not directly hit, 300 new cars and 100 employee cars were destroyed. The Belvidere Assembly Plant is adjacent to the Chrysler-operated Belvidere Satellite Stamping Plant. The stamping plant produces sheet metal parts for the production line. The factory has of floor space over of land, and had produced 5.9 million vehicles by the end of the 1993 model year. In 2006, the factory became the first Chrysler plant to use a body shop consisting entirely of robotics. The 780 robots in the body shop could make necessary tool changes automatically, within a 47-second cycle time. The factory is capable of building three models of vehicles as well as test-building a fourth vehicle. The Simulation (SIM) Room comprises of the factory and is used to create a miniature production process and to test the layout of job stations, and creating standard work instructions. A two-foot grid is painted on the floor to measure dimensions and employee walk-time during simulated production and efficiency modeling. In October 2010, it was announced that $600 million were to be invested into the Belvidere Assembly Plant in preparation for 2012 model year vehicles to be built there. The
Dodge Dart (PF) was announced in December 2011 to be built at the plant. On December 9, 2022, Stellantis announced that Belvidere Assembly would be placed into an "indefinite closure" effective February 28, 2023. The Belvidere site was a point of contention in
2023 United Auto Workers strike, with the
United Auto Workers and Stellantis negotiating a future use for the site. The resulting contract, announced on October 28, 2023, includes the reopening of the plant in early 2025, reportedly to assemble a new mid-size
Ram pickup truck. A planned expansion would also add an electric vehicle battery plant, creating 1,100 new jobs at the facility. On March 31, 2023, the plant was struck by a second tornado, which removed two
air handlers from the roof of the plant, causing a gas leak (the same tornado also caused
the collapse of Belvidere's Apollo Theatre)). On November 9, 2023, President
Joe Biden visited Belvidere and held a speech with local UAW leaders on the reopening of the plant. In August 2024, Stellantis has said that it was delaying investments in the plant. As of November 2025, Stellantis plans to begin pilot production and testing of the Jeep Compass line in December 2026 with sellable units starting production in December 2027. Jeep Cherokee production will start in November 2028. The Ram mid-size truck was assigned to the
Toledo Complex. ==Labor==