GM halts full-size pickup production in Fort Wayne, Flint because of parts shortage Jamie L. LaReau | Detroit Free Press (TNS) For the first time this year General Motors will halt production of its full-size pickups at two U.S. plants. GM said it is canceling overtime shifts this weekend at Flint Assembly and Fort Wayne Assembly in Indiana due to a parts shortage. Also, there will be no summer shutdown this year at the majority of GM's U.S. plants. The automaker said it will run the majority of its car assembly plants in North America through the traditional two-week summer shutdown for the second year in a row.