Higher-strength steel floor: As before, the Silverado has a roll-formed, high-strength steel bed floor. For 2019 a higher-grade steel is used, with yield strength increased from 340 to 500 megapascals of pressure for optimal strength and mass...
...Remarkably, it’s also lighter, weighing 450 pounds (204 kg) less than today’s truck when comparing crew cab V-8 models.
The weight savings comes from extensive use of mixed materials...
For example, the body is 88 pounds (40 kg) lighter than before due to mixed materials use. All exterior swing panels (doors, hood and tailgate) are made of aluminum while fixed panels (fenders, roof and bed) are made of steel. The underlying safety cage uses seven different grades of steel, each tailored for the specific application.
The fully boxed steel frame is also 88 pounds (40 kg) lighter than its predecessor, while offering 10 percent greater torsional rigidity. Eighty percent of the frame is made of high-strength steel varying from 2 to 5 millimeters in thickness, and every millimeter is optimized for performance using a variety of processes, including hydroforming, roll forming, conventional stamping and tailor-rolled blanking. As a result, frame sections, gauges, grades, processes and materials strategically vary to maximize strength, durability and stiffness without adding unnecessary mass.
Mixed materials also play a part in the all-new suspension. The front independent short/long arm suspension features new forged-aluminum upper control arms that are lighter and provide better wheel alignment than the stamped component they replace. The live-axle rear suspension is also redesigned, including new composite second-stage springs on LT models that save about 12 pounds (5 kg) per side over the steel springs they replace.
