DETROIT — Nine million parts.
That’s what General Motors needs to repair millions of cars it has recalled since Feb. 7. With ignition switches, power steering motors and other parts slowly arriving at dealers, frustrated drivers face waits of weeks or months, some while driving cars they fear are unsafe.
Any recall can present challenges for automakers and customers. Still, most recalls include less than 50,000 vehicles and are typically completed in two or three months.
But experts say eight…