Performance Online’s 1958-64 Chevy Impala power steering gear boxes are built to precise specifications and tolerances. Gear box isbased off of the Delphi 600 Series gear box. This Performance Gear Box utilizes the latest in steering technology including a rack and pinion style servo and specifically tuned effort characteristics. The result is quick response, precise control, and smooth operation (through out) the entire steering range. produces excellent road feel and driver feedback.