Sept 22 (Reuters) - General Motors Co
* General Motors says will invest $294 million in Spring Hill Manufacturing for a future cadillac crossover and additional upgrades at the facility
* General Motors says the exact impact on employees will be determined over the next several weeks as we recalibrate production schedules
* General Motors Co - believe best way to react to moderating of market is to reduce output and operate on two shifts in Spring Hill plant from Nov 27 Source text for Eikon: Further company coverage: