General Motors will spend $328m to prepare an assembly plant in Flint, Michigan, to build redesigned Chevrolet and GMC full-size pickup trucks, creating or retaining a claimed 150 jobs.

The plant, currently with 2,047 employees, builds heavy duty versions of the Chevrolet Silverado and GMC Sierra.  Sales of the trucks, redesigned for the 2011 model year, resulted in a claimed additional 2.4 percentage points of market share (to the end of May), bringing GM’s total heavy duty share to 36%.

Last January, GM said it would add a third shift at Flint, returning 750 jobs to the factory.

The automaker this week claimed its retail share of the full size pickup market grew to 40.4% to the end of May compared with 37.7% in the first five months of 2010.

The latest investment is part of $2bn GM is spending that will create or retain about a claimed 4,000 jobs in 17 facilities in eight states over the next 18 months.