
The floorpan is a large sheet metal stamping that often incorporates several smaller welded stampings to form the floor of a large vehicle and the position of its external and structural panels. In the case of monocoque designs, the floorpan is the most important metal part establishing the chassis, body, and thus the car’s size. It serves as th...
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http://en.wikipedia.org/wiki/Floorpan

The largest and most important stamped metal part in a car's body. Usually assembled from several smaller stampings, the floorpan forms the floor and fixes the dimensions for most of the car's external and structural panels. It is also the foundation for many of the car's mechanical parts.
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http://www.caranddriver.com/reviews/glossary-of-terms-info
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