h 1989 SPEEDO GEAR USAGE CHART ST TRUCK EFFECTIVE 1989 MECHANICAL SPE EDO GEARS ARE NOT REQUIRED FOR ELECTRICAL VEHICLE SPEED SENSOR BUFFER REFER TO GROUP 3 682 1990 GENERAL MOTORS ssnvncz PARTS 01 ERAT10Ns LT TRUCK 52S REV 10 90 4 109 4 450