Chrysler is adding a third shift at its Warren Truck plant to meet demand for the new 2013 Ram pickup. And with tight supplies of its Pentastar V6, the company is also boosting output at its Mack Engine plant.

The expansions will add 1,250 jobs and are part of a $238 million investment by Chrysler in the Detroit area. Warren's third shift will begin work sometime in the spring, a Chrysler rep told Automotive News. Mack's increased Pentastar production a could include both 3.6 and 3.2-liter engines.

The company says it also plans to invest $40 million in its Trenton Engine plant to allow for production of a 3.2-liter V6 as well as the Tigershark inline-four for the upcoming Jeep Liberty replacement.