The compact 400 Series™ power steering box utilizes late model steering technology for your classic. These are a direct replacement for the original manual steering box and keep perfect alignment with the OE or aftermarket column. The compact design is closely modeled after the original manual steering box. With its 13.6:1 ratio (2.75 turns lock to lock) it has the performance handling of many rack and pinion conversions without the need for extensive modifications. This box uses the original MANUAL steering pitman arm. Both the 400 Series™ & 500 Series™ have a ¾" -30 input shaft and use inverted flare hoses (11/16"-18 pressure fitting & 5/8"-18 return fitting). These are the perfect solution for your bolt on performance power steering needs!