Chrysler Group says it is eliminating a shift at its 780-person Mack Avenue Engine 1 plant in Detroit beginning in January. The move is expected to result in more than 300 job cuts.

The plant, which makes 4.7L V-8 engines for the Jeep Grand Cherokee, Jeep Commander and Dodge Durango SUVs and Dodge Dakota and Dodge Ram pickups, recently was named one of the most efficient V-8 overhead cam engine producers in North America by the Harbour Report, a highly respected ranking of auto industry plants and facilities.

The cuts at Mack Avenue Engine 1 come as a result of a downturn in the popularity of SUVs and pickups. Chrysler built 87,200 fewer vehicles in the third quarter than year-ago, in part due to softening truck demand.