ATTENTION CATALOG USER SEPTEMBER 1990 THE FOLLOWING CATALOG CHANGES ARE IN PLACE FOR SEPTEMBER 1990 THIS CATALOG FOLDS IN MODEL YEARS 1985 THRU 1991 EFFECTIVE WITH THE 1991 MODEL YEAR SPO WILL ADHERE TO CORPORATE UNIFORM PARTS CLASSIFICATION UPC FUNCTIONAL NAME ADDRESS FNA STANDARDS PART NAME CHANGES MAY OCCUR TO MEET THE NEW UPC FNA STANDARDS SPECIAL NOTICE THE FOLLOWING CHARTS HAVE BEEN MOVED FROM THE INFORMATION SECTION IN THE PARTS CATALOG TO THE NEW REFERENCE CATALOG BB ABBREVIATIONS METRIC INFORMATION GM PRODUCTION OPTIONS SERVICE IDENTIFICATION LABELS THE FOLLOWING CHARTS HAVE BEEN MOVED FROM THE INFORMATION SECTION OF THE PARTS CATALOG T0 THEIR PRIME GROUP ENGINE I D CODES 00 000 TRANSMISSION I D CODES 04 000 REAR AXLE I D CODES 05 000 FRONT AXLE I D CODES 06 000 CATALOG TEXT TO ILLUSTRATION CROSS REFERENCE BEGINNING WITH THE SEPT OCT 1990 PUBLICATIONS ALL LIGHT TRUCK CATALOGS WILL HAVE A TEXT T0 ILLUSTRATION CROSS REFERENCE IT WILL GIVE THE PAGE AND CALLOUT NUMBER I E PG 4 12 2 THIS MEANS THE PART IS FOUND ON PAGE 4 12 CALLOUT NUMBER 2 IN THE ILLUSTRATION SECTION THIS WILL APPEAR AT THE END OF THE DESCRIPTION FIELD ILLUSTRATIONS EFFECTIVE WITH THIS PRINTING CRASH ILLUSTRATIONS LOCATED IN SECTION 18 000 HAVE ALSO BEEN RETURNED BACK INTO THEIR INDIVIDUAL GROUP SECTIONS YOU MAY NOW ACCESS THE REGULAR ILLUSTRATION SECTION OR THE CRASH SECTION FOR YOUR SERVICE PARTS IDENTIFICATION NEEDS TRANSMISSIONS AND REAR AXLES ARE FULLY ILLUSTRATED AND HAVE 100 PART NUMBER COVERAGE CONTINUED ON NEXT PAGE Q 1990 GENERAL MOTORS SERVICE PARTS 0PERATIONS LT TRUCK 52R REV 98O