Toyota Texas will spend $531 million to expand its San Antonio manufacturing site and create 400 new jobs, company officials said Friday. The new 500,000-square-foot addition to the sprawling South Side plant will produce drivetrain parts for the nearly 20-year-old facility.  “Our team members are ready for this new opportunity to grow our plant’s capabilities and workforce,” Toyota Texas President Susann Kazunas said in a written statement.