I I MX03 011 NOTE 1 IST DESIGN CONTROLLER HAS CIRCUIT BOARD ECM USED WITH A T MD9 2 39 RATIO PART NUMBER STAMPED POWER STEERING PRESSURE SWITCH IS NOT REOUIRED NOTE 2 2ND DESIGN CONTROLLER HAS 1 CIRCUIT BOARD ECM USED WITH A T MD9 2 39 RATIO PART NUMBER STAMPED ALSO USES POWER STEERING PRESSURE SWITCH WITH A C FOR INPUT TO THE f ECM V I I I T I 1991 GENERAL MOTORS SERVICE PARTS OPERATION S CHEVROLET 17W 3 000 GROUP 3 164 v I 6 91