P20 1978 PONTIAC 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 lnk Stamped on Bell Housing A SERIES ASSEMBLY CODES M15 3 SPD MAN M20 4 SPD MAN M29 3 SPD AT RZ S3 BZ PH CO PG M33 3 SPD AT KD MD KE MP JC MH JD B SERIES ASSEMBLY CODES M29 3 SPD AT M33 3 SPD AT BZ PL KE MJ LA CO KH MD LH JC MH LC JD MP LE F SERIES ASSEMBLY CODES MI5 3 SPD MAN M20 4 SPD MAN M21 4 SPD MAN M33 3 SPD AT JC JD LP KC MC ME MK G SERIES ASSEMBLY CODES M15 3 SPD MAN M29 3 SPD AT M33 3 SPD AT RZ PH PG KE MP CO H SERIES ASSEMBLY CODES M20 4 SPD MAN M75 5 SPD MAN M29 3 SPD AT RJ U6 PY M33 3 SPD AT KA KL X SERIES ASSEMBLY CODES M15 3 SPD MAN M20 4 SPD MAN M29 3 SPD AT UB ZM PY M33 3 SPD A T JC JD KC 1987 GENERAL MOTORS SERVICE PARTS OPERATIONS PONTIAC 21 34