T19 MUNCIE MANUAL TRANSMISSION PRODUCTION CODE EXPLANATION Muncie Truck 4 S d Stamped on the rear face of the transmission case below the rear retainer The production code number contains the source code model year and build date E 1 TA SOURCE CODE MODEL YEAR BUILD MONTH DAY CODE N 4 speed 1979 A Jan 10th Muncie B Feb I CH465 C Mar D Aer E May H June K July M Aug V V P Sem FI Oct S Nov T Dec 350 Model Turbo Hydra Matic Transmission J The production code consists of the source code followed by the model year month date and shift produced EXAMPLE B 9 K D5 D MONTH DAY SOURCE CODE MODEL YEAR CODE OODE SHIFT CODE B Parma 1979 A Jan Sth D 1st Shift Y Toledo B Feb N 2nd Shift J GM of Canada C Mar D Apr E May H June K July V M Aug P Sept R Oct S Nov T Dec The identification coda number is stamped on the right side of the transmission oil pan WAREHOUSING AND DISTRIBUTION DIVISION OF GENERAL MOTORS CORPORATION LT TRUCK 5ZA 40 REV 1 84