TRUCK TRANSMISSION PRODUCTION CODE EXPLANATION Continued MUNCIE TRUCK 4 SPEED 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 EXAMPLE N F A 10 SOURCE CODE MODEL YEAR BUILD MONTH DAY CODE T N 4 Speed 1985 A Jan K Jul 10th Muncie B Feb M Aug CH465 C Mar P Sept D Apr R Oct E May S Nov H Jun T DSC 350 MODEL TURBO HYDRA MATIC TRANSMISSION The Eroduction code consists of the source code followed by the model year mont date and shift produced EXAMPLE B F K 05 D SOURCE CODE MODEL YEAR MONTH CODE DAY CODE SHIFT CODE B Parma 1985 A Jan 5th D lst Shift Y Toledo B Feb N 2nd Shift J GM of Canada C Mar D Apr E May H Jun K Jul M Aug P Sept R Oct S Nov T Dec The identification number is stamped on the right side of the transmission oil pan 571991 GENERALMOTORSSERWCEPARTSOPERAUONS iTTRUCK 52G 4 000 4 4 1 91