1985 TRUCK MANUFACTURING SOURCE A TRANSMISSION STAMPING INFORMATION Source stamping information for the 1985 Truck Transmission consists of five 5 characters two 2 alpha and three 3 numeric as shown below POSITION 1 V MANUFACTURING SOURCE CODE The following alpha codes will be stamped in the first 1st position identifying the Manufacturing Source CODE MANUFACTURING SOURCE TYPE B Parma CBC A J GM of Canada CBC K S Muncie Four 4 Speed 70mm Light Duty N Muncie Four 4 Speed 117mm Truck R Muncie Four 4 Speed 76mm Light Dutyv S Muncie Three 3 Speed 76mm L1ght Duty Y Toledo CBC posxrxou 2 MODEL YEAR The letter F will be stamped in the second 2nd position for model year 1985 POSITION 3 I I A CALENDAR MONTH PRODUCED A U The following alpha codes will be stamped in the third 3rd position identifying the calendar month produced CODE MONTH A A January B February Y C March D April l E May H June K July M August R P September R October S November T December 1990 GENERAL MOTORS SERVICE PARTSOPERATIONS LT TRUCK 52S t i REV 10 90 4 3 Y 4 000