AP02 For 1955 1956 1957 Power Steering Gear Box 500 Series Gear Box Bel Air 210 SGB5557 This power steering gear box is designed for 1955 1956 1957 cars.It uses valve technology to enhance road feel and driver feedback, improving steering performance.The 500 Series features a housing with no welding, all metal parts, and accepts a standard pitman arm.It has a 14:1 steering ratio for responsive handling.Specifications: Input spline is 3/4-30 Steering ratio is 14:1 Direct replacement for GM 605 box Input shaft matches 3/4-30 spline found on 605 box Sector shaft is 1 inch with 36 tooth tapered spline, compatible with 1955-64 pitman shaft Pressure fitting is 7/16 inch tube with 11/16-18 inverted flare port Return fitting is 3/8 inch tube with 5/8-18 inverted flare port Overall distance from center of adjuster to end of pitman shaft is 14 inches Housing length where it mounts to frame in 3 bolt pattern is 6-3/8 inches Bolt pattern measures 3-3/16 inches center to center on two holes parallel to pitman shaft Bolt pattern measures 3-1/8 inches center to center on two holes perpendicular to pitman shaft Main body length from input shaft to end of housing is 11-3/4 inches Distance from tip of input shaft to center of output housing is approximately 7-1/2 inches Distance from end of pitman shaft to center of input housing is approximately 10-3/4 inches