Usually powertrain is used to refer to simply the engine and transmission, including the other components only if they are integral to the transmission. A motor vehicle's driveline or drivetrain consists of the parts of the powertrain excluding the engine and transmission. It is the portion of a vehicle, after the transmission, that changes depending on whether a vehicle is front-wheel, rear-wheel, or four-wheel drive, or less-common six-wheel or eight-wheel drive.
The Great Recessionâwhich officially lasted from December 2007 to June 2009âbegan with the bursting of an 8 trillion dollar housing bubble. The resulting loss of wealth led to sharp cutbacks in consumer spending.
The severity of the Great Depression in the United States becomes especially clear when it is compared with Americaâs next worst recession, the Great Recession of 2007â09, during which the countryâs real GDP declined just 4.3 percent and the unemployment rate peaked at less than 10 percent.