After more than a year of watching Republican presidential candidate Donald Trump bash Ford Motor Co. for moving jobs to Mexico, General Motors Co. has pushed ahead with its own expansion. It just hasn’t said as much as Ford.

GM is advancing on an $800 million investment for its global small-car lineup that includes a factory retooling in San Luis Potosi state. That plant and another facility in Mexico will also build the all-new Chevy Equinox sport-utility vehicle next year, people familiar with the matter said.