1979 CHEVROLET TRANSMISSION IDENTIFICATION A SERIES ASSEMBLY CODES M15 3 SPD MAN M20 4 SPD MAN M29 3 SPD AT BZ CS CR CA M33 3 SPD AT IV 3B 3 SFD AT KE WG TA TR WA B SERIES ASSEMBLY CODES M29 3 SPD AT I M33 3 SPD AT M38 3 SPD AT CV CU TA TP 1 R F SERIES ASSEMBLY CODES M15 3 SPD MAN A M20 4 SPDPMANR M38 3 SPD AT TA TP TR TI WF M21 4 SPD MAN UH H SERIES ASSEMBLY CODES M20 4 SPD MAN M75 5 SPD MAN M29 3 SFD AT UM US FA PC M33 3 SPD AT M38 3 SPD AT KL KK I A WD X SERIES ASSEMBLY CODES MI5 3 SPD MAN M20 4 SPD MAN A I I M38 3 SPD AT I TA TC TR TS T SERIES ASSEMBLY CODES MY1 4 SPD MAN I I JI LID3 3 SPD AT GM PARTS DIVISION GENERAL MOTORS QORPORATION CHE FIOLET 1 0 I 26