Last year GM announced plans to invest $350 million in the Tennessee assembly plant to build two future midsize vehicles. The plant already builds several small gasoline engines plus the Chevrolet Equinox midsize SUV.
GM also announced Wednesday that it would invest just under $50 million at its Bedford, Indiana, engine block casting plant, keeping 45 jobs.
The company was holding a news conference at the Spring Hill factory on Wednesday to formally make the announcements.
The Cadillac SRX now is built at a GM factory in Ramos Arizpe, Mexico. That plant also builds the Chevrolet Sonic subcompact car and Chevy Captiva small SUV.