I T18 V TRUCK TRANSMISSION PRODUCTION CODE EXPLANATION Iii I I he truck transmission codes are located as follows Three speed Saginaw Type The code Is stamped on the left side of the case inst below the side cover The woduction code number contains the source oode model year and build date SOURCE CODE MODEL YEAR BUILD MONTH DAY CODE S 3 Speed 1979 A Jen 10th Saginaw Type B Feb C Mar V D Apr E May H June K July M Aug P Sent R Oct S Nov lg T mc fhreespeed Trams he identification code is located on upper left attachment ear too slde The production code number contains the source code month model year and build sequence SOURCE CODE MONTH YEAR BUILD SEQUENCE Tremec A Jan 1979 B Feb I C Mar D Apr E Mav I F June I G Julv H Aug J Sem K Oct L Nov M Dec I WAREHOUS NG AND DISTRIBUTION DIVISION 0F GzNEnAL MOTORS CORPORATION LT TRUCK s2A REV 1 B4 ae