General Motors Co. has swept the top three spots in the 2012 J.D. Power and Associates Initial Quality Study for large pickup trucks, GM officials announced Wednesday. The top two vehicle models are assembled in Allen County.

This is GM’s best-ever showing in the annual study.

The GMC Sierra light duty ranked first, the Chevrolet Silverado heavy duty finished second, and the Chevy Avalanche was third. Each of GM’s four U.S. brands earned a segment award in the quality study.

J.D. Power is a global marketing information services company that provides customer satisfaction research, market research, automotive forecasting, social media research and performance improvement programs for several industries.

GM’s Allen County truck assembly plant employs about 3,600 working three shifts.