American Axle & Manufacturing (AAM) is GM's right-hand man for driveline systems and forged products. AAM manufactures axles, driveshafts, and chassis components, mainly for light trucks and SUVs, but also for cars and crossover vehicles. Axles and driveshafts account for more than 80% of AAM's sales; chassis components, forged products, and other components make up the rest. The Tier 1 supplier gets nearly three-quarters of its business from GM; other customers include PACCAR, Chrysler, Harley-Davidson, VW, and Ford. AAM operates more than 35 manufacturing facilities around the world and earns 56% of its revenue from sales in North America.