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.
During the Great Recession, real GDP fell by about 4% from just under $16 trillion in Q2 2008 to $14.4 trillion in Q2 2009. Since that time, the overall economy has rebounded, with Q2 2015 GDP estimated at $16.3 trillion. Business Insider/Andy Kiersz, data from FRED.