I 1 1978 CHEVROLET TRANSMISSION IDENTIFICATION I A SERIES ASSEMBLY CODES M15 3 SPD MAN M20 4 SPD MAN M29 3 SPD AT RZ S3 S4 BZ CS CD M33 3 SPD AT MBB 3 SPD AT KE A I AN AG TE B SERIES ASSEMBLY CODES I M29 3 SPD AT M33 3 SPD AT M38 3 SPD AT I CO CV KE AG A I AN WK F SERIES ASSEMBLY CODES I I MI5 3 SPD MAN M20 4 SPD MAN M38 3 SPD AT UR ZM AG WEI AJ WK I AN I M21 asm MAN I ZU I I SERIES ASSEMBLY CODES M20 4 SPD MAN M75 5 SPD MAN MZS 3 SPD AT I U2 U3 RK RJ CA US U7 M33 3 SPD AT M38 3 SPD AT KK wc I X SERIES ASSEMBLY CODES MI5 3 SPD MAN M20 4 SPD MAN M38 3 SPD AT I UR ZM AG WZ AH W I AJ I N T SERIES ASSEMBLY CODES I MY1 4 SPD MAN MD3 3 SPD A I I DB UA ND I I GM PARTS DIVISION GENERAL MOTORS CORPORATION CHEVROLET 1O 4 7 A