Factory steering boxes can be slow turning and become sloppy as they develop wear, resulting in poor feedback and a loose feel. Replace that old steering box with a 670 steering box built specifically for Speedtech by Lee Engineering. Based on the GM 600 Series Box, Lee applies four decades of experience to bring each unit up to their standards, which includes magnafluxing, re-honing, revalving, and blueprinting finished with a special plating process, and then dyno testing. These steering boxes have specific internal custom valving for Pro Touring type GM G-bodies and are available in two different steering ratios.