CIHIART INFORMATION PAGES CHART DIESIGEN The charts are designed to list all items which are dletails of the l lajor Assemblies listed numerically at the top of the chart pages l lajor Groups may contairl more than one chart Please note each chart has a description header which identifies the major assembllies listed an l l he text group they are found in example Wheels Front Drum I lub Wheel 6 307 The text group lists l lajor Assemblies with applicable dlescription model and year usage Service notes are provided to guide proper location of service parts Parts used in conjunction with ll lajor Assemblies and are not listed as details are located in the appropriate text group Hang on or loose items TO ILOCATEE PAIRTEEL IVlajor AssembIies must be known Please refer to major assembly identification aids vehicle serial number plate truck broadcast sheet service parts identification label major component part number lalziel l Iajor Assembly parts book group l lajor Assembly details are listed alphabetically in a vertical chart form by line number Each line has one description o nIy and includes GINIT and WDDGIVI group numbers for reference General l lotors uses two different grouping systems lor truck parts books The Gl IT system is used for all heavy duty model parts books and the W l D 3l l system for the medium duty model books Please refer to the General llnformation Pages for detailed parts group usage information IF NOUN NAME IS NOT KNOWN Flefer to the lIIustration Catalog keeping in mind the l lajor Group number and described area Locate the appropriate illustration and determine the part required on the illustration The nouln name and group nurnber is listed in the legend Please refer to the IlIustration Catalog Introduction pages for additi onaI user information IF NOUN NAME IS KNOIWN Refer to the AIphabetical lnde asa guide to identify group number Please note lf the group number is not found in the text the group is charted Scan down the chart lines and llocate noun name using group number as a guide Description and or usage is also provided to assist identification Locate the Major AssernbIy part number at the top of the chart and scan down to line number of the parts noun name In this box you will find the quantity required part number and vendor number or note 5 1 CHART