Brand New Borgeson Street and Performance Quick Ratio GM Power Steering Box, 12.7:1 Ratio (Part #11009565). Borgeson Street & Performance Quick Ratio GM Power Steering Box. Borgeson Universal now offers an all new modern quick ratio power steering box to replace the Saginaw/Delphi 800 series in most 1964 and up GM muscle cars. This all new power steering box has a quick 12.7:1 ratio with firm modern steering feel. The Borgeson Street & Performance power steering box will bolt directly to the stock location and fit to the original power steering pitman arms. Steering box includes adapters to be able to use either O-ring or flare style hose connections. This new Borgeson steering box uses a ¾”-30 spline input shaft and all pre-1977 cars will require a lower rag joint half. NOTE: Cars switching from manual steering will require a power steering pitman arm. Rag joint half-coupler is necessary to adapt Pre-1979 stock steering shaft (D-Shape) to 600 Steering Gear. Compatible with: Buick 1978-1988 Regal 1964-1977 Skylark Chevrolet 1967-1992 Camaro 1965-1970 Caprice 1964-1977 Chevelle 1964-1977 El Camino 1965-1970 Impala 1968-1974 Nova 1978-1988 Malibu 1978-1988 Monte Carlo 1982-2002 S-10 GMC 1964-1977 GM “A” Body 1978-1988 GM “G” Body 1982-2002 S-15 Oldsmobile 1964-1988 Cutlass Pontiac 1967-1992 Firebird You can view and download the dimension/instruction booklet here.