The Power Steering Gear Box is a direct replacement part designed for 1999-2007 Chevy Silverado and GMC Sierra trucks. It comes in various models to fit specific vehicle types and years, including Silverado and Sierra 1500 Classic, Silverado 2500 HD Classic, Sierra 2500 HD Classic, and Silverado 3500 Classic. The gear box is made of steel, with a limited lifetime manufacturer warranty. It includes 3 mounting holes, M18 x 1.5 pressure port thread size, M16 x 1.5 return port thread size, and 33 splines and 3 blanks on the sector shaft. The gear box is essential for providing power steering assistance to the vehicle, ensuring smooth and reliable steering performance.