CHART INFORMATION PAGES CHART DEJSLIGN The charts are designed to list all items which are details ofthe Major Assemblies listed numerically at the tcp of the chart pages Majcr Groups may contain more than one chart Please note each chart has a description header which identifies the major assemblies listed and the text group they are found in example Wheels Front Drum Hub Wheel 6 307 The text group lists Major Assemblies with applicable description rnodel and year usage Service notes are provided to guide proper location of service parts Parts used in conjunction with Major Assemblies and are not listed as details are located in the appropriate text group Hang on or loose items TO LOCATE PARTS l lajor Assemblies musl be known Please refer to major assembly identification aids vehicle serial number plate truck broadcast sheet service parts identification label major component part number label Major Assembly parts book group Major Assembly details are listed alphabetically in ai vertical chart form by line number Each line has one description only and includes GM and VVDDGM group numbers for reference General Motors uses two different grouping systems for truck parts books The GMT system is used for all heavy duty model parts books and the Vt DDGM system for the medium duty model books Please refer to the General information Pages for detailed parts group usage information IF NIOUNI NAME IS NOT KNOWN Refer to the lllustration Z ataIog keeping in mind the Major Group number and described area Locate the appropriate illustration and determine the part required on the illustration The noun name and group number is listed in the legend Please refer to the lIlustration Catalog Introduction pages for additional user information IF NIOUN NAME IS KNOWN Refer to the AIphabetica Inde as a 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 locate noun name using group number as a guide Description and or usage is also provided to assist identification Locate the Majcr Assembly part number at the top of the chart and scan down to line number ofthe parts noun name In this box you will find the quantity required part number and vendor number or note 3 1 CHART