Detroit ? Chrysler LLC said Monday it will indefinitely close one Missouri plant and cut production at another because of slumping demand for pickup trucks and minivans.

Officials with the Auburn Hills-based automaker said in a conference call that it will shutter the St. Louis South plant, which makes minivans, effective Oct. 31. The St. Louis North plant, which makes full-size pickups, will be cut from two shifts to one effective Sept. 2.

Chrysler said the moves would affect 2,400 jobs. That includes 1,500 at the minivan plant and another 900 at the pickup truck plant, which both are in Fenton, a St. Louis suburb.

Chrysler President and Vice Chairman Tom LaSorda said the company has no plans to reopen the minivan plant.