GENERAL INFORMATION T Complete familiarity with the information contained on these pages as well as the general layout of the Parts Book will prove helpful in locating and ordering the desired parts The Book is arranged in sections as follows Model Series Identification le Alphabetical Index Chassis Parts Listing groups 0 000 to 9 000 inclusive Commercial Body Parts Listing groups 16 000 to 17 999 inclusive J Numericallndex Group Conversion Index The Group System of listing parts is used and briefly is as follows Main units of the vehical are identified bv the Numeral preceding the Decimal i e Engine 0 Oooling and Oiling 1 Electrical 2 Fuel System 3 Some Parts may be listed elsewhere than in its original or prime Group and in such listing the prime Group is indicated in parentheses This procedure is necessary as a part can have but one identifying Group Number for ordering or bin location For example under Group Number 3 751 Part Number 7020926 is listed as Carburetor Choke Valve Screw and the prime Group 3 820 is shown in the description column For convenience all parts added to a reprint will be indicated with an asterisk following the model year This asterisk will appear for one reprint only Brake application charts appear in iront of group 4 589 These charts rnust be used to determine the correct brake system and replacement parts READING TRUCK MODEL APPLICATION I The Truck Models included in this publication are listed as follows Conventionals Forward Control G Models and Forward Control P Models Conventional Models will be indicated with a C Conventional Models with 4 Wheel Drive will be indicated with a K J Forward Control Step Van Models will be indicated with a P Forward Control Cab Van Chevy Van and Vandura Models will be indicated with a G There are also specialized vehicles which are always called out separately V These are the Blazer Jimmy and MHC Motor Horne Chassis The Blazer Jimmy is a light utility vehicle which comes in C Models and K Models The MHC is a chassis used in the building of Motor Homes For 1973 77 when the model application in the parts catalog reads All this picks up All CKGP Models but does not pick up the Blazer Jimmy or MHC These models are always called out separately in these model years For further clarification see the Truck Series Identification Charts which follow the General information Section or the catalog r 1978 TRUCK CATALOG FORMAT The 1978 truck catalog format is written in a smiliar way to that of the passenger car catalog using model codes in plaoe of body styles RPO regular production options will also in most cases be called out in code w description vvhere needed Refer to the RPO list for proper identification of RPO s WHEELBASE When the wheelbase dimension is essential to differentiate between models a 3 digit model number will be used a Example CK209 43 All CK2 w 164 5 W B and Cab 4 door CK109 03 All CK1 w 131 5 W B and Cab 2 door only V Gll3 213 All Gl 2 w 125 W B only P314 42 All P3 w 157 W B exc M H C G310 All G3 w 110 W B only CKl05 Blazer Jimmy only WAFlEHOUSlNG AND DISTRIBUTION DIVISION OF GENERAL MOTORS CORPORATION LT TRUCK 5l 2 REV 2 83