Patent ID: 6964628

Claim:
A method for modifying the hydraulic circuitry of a “factory installed” automotive transmission of the type including at least first and second fluid flow passageways disposed in fluid communication between a “factory installed” manual valve and a “factory installed” manual timing valve, said manual timing valve being disposed in fluid communication between said at least first and second fluid flow passageways and a “factory installed” low and reverse modulator valve such that fluid pressure from both of said first and second fluid flow passageways is simultaneously applied to said low and reverse modulator valve through said manual timing valve; the steps of said method comprising: modifying said “factory installed” manual timing valve such that fluid pressure is applied to said modified manual timing valve simultaneously from both of said first and second fluid flow passageways to move said manual timing valve until a predetermined pressure is applied thereto, and thereafter causing said manual timing valve to block fluid flow through said first fluid flow passageway so that fluid pressure is applied to said low and reverse modulator valve through said manual timing valve only through said second fluid flow passageway.