GM to invest $5.4 bln in US plants in next 3 years

General Motors has announced $5.4 billion in new U.S. plant upgrades over the next three years, including in three sites in Michigan, the traditional hub of the U.S. auto industry.

The biggest investment outlined is $520 million for a site near Lansing to build tools and equipment for GM's future vehicle programs. The move will retain 1,900 jobs at the site, the company's newest plant in North America, the automaker said on April 30.

The other two Michigan sites receiving funds are GM's Pontiac Metal Center in Pontiac, Michigan and a site in Warren that will get a new body shop. The three Michigan projects total $783.5 million.

GM said it will detail the remaining $4.6 billion in investments over the next several months.