For a full explanation on decoding the model code and wheelbase refer to the truck series identification chart m When using the dimensions and other data shown inthe Description Column the parts manager should be guided by the following 1 length overall refers to the total length of a part measured over the longest dimension An irregular shaped piece is measured over the longest dimension regardless of contours and bends 2 dev length refers to the total length of a part such as a tail pipe or gas pipe measured as though the part were straightened out This measurement can be taken on formed pipes by using a string to follow the contours of the pipe and then measuring the length of string used 3 l D refers to inside diameter O D ref to outside diameter O S refers to oversize U S refers to undersize r To locate the listing of a Part determine the model vehicle and refer to the Book under the Group Number identifying it which may be determined by using any of the following three methods 1 Consult Alphabetical Index at front of book which lists Parts by noun and descriptive names and I refers to the exact Group Number where all Parts of similar kind may be found lf Name of desired Part is not readily found in the Index a correlated Part Name will suggest approximate location 2 Consult Illustrations on which Group Numbers and Noun Name are shown which will refer to the Part or Assemblywanted On Illustrations where both left and right part numbers are listed the first y number will always designate left hand side 3 I Consult Numerical Index if a Part Number is known and use its Group Number to locate a similar Part or be directed to the approximate location of correlated Parts The column headed No Used indicates the number of pieces required The term A R means As Required u lf Body is not of General Motors manufacture place orders direct with the manufacturer whose name appears on the Body Name Plate WAREHOUSING AND DISTRIBUTION DIVISION OF GENERAL MOTORS CORPORATION LT TRUCK 52S 4 REV 9 82