L20 1978 OLDSMOBILE TRANSMISSION IDENTIFICATION NOTE Transmission Identification can be Located in One of Three Positions on the Transmission A Identification Plate on Side of Case B Stamping Number on Governor Cover C Ink Stamped on Bell Housing A SERIES ASSEMBLY CODES M l5 3 SPD MAN M20 4 SPD MAN M75 5 SPD MAN RZ S4 RR U7 M29 3 SPD AT M33 3 SPD AT BZ OW KE LD CO CR JC JD B SERIES ASSEMBLY CODES M29 3 SPD AT M33 3 SPD AT BZ OW KE KH OS OT LA LC LD LE LH LJ LK C SERIES ASSEMBLY CODES M29 3 SPD AT M40 3 SPD AT OT OB OC OD E SERIES ASSEMBLY CODES M40 3 SPD AT OJ H SERIES ASSEMBLY CODES M20 4 SPD MAN M75 5 SPD MAN M29 3 SPD AT ZR RH RJ U6 PY M33 3 SPD M38 3 SPD AT KL WC SERIESASSEMBLY CODES Ml5 3 SPD MAN rM2O 4 SPD MAN M75 5 SPD MAN S9 ZM U7 rM33 3 SPD AT JC JD KC 1987 GENERAL MOTORS SERVICE PARTS OPERATIONS OLDSMOBILE 31 i 34