1 CORVAIR REAR AXLE IDENTIFICATION Axle identification is stamped on differential carrier along with date of manufacture 1960 1963 Plant Plant Identification Identification Series Type G A Buffalo Series Type G A Buffalo Warren CORVAIR 3 Speed 3 55 ratio BT CORVAIR 3 or 4 Speed 3 27 ratio HA CORVAIR 3 Speed 3 89 ratio BR CORVAIR 3 cx 4Spaed 3 55 ratio HB CORVAIR Automatic Transmission 3 55 ratio BU CORVAIR Automatic Transmission CORVAIR Automatic Transmission 3 89 ratio as 3 27 ratio HC A CORVAIR Automatic Transmission 3 55 ratio H D CORVAIR Positraction 3 27 ratio HG CORVAIR Positraction w Automatic 1961 Transmission 3 27 ratio HH O CORVAIR Positraction 3 55 ratio HJ CORVAI R Positraction w Automatic CORVAIR 3Speed or 4 Speed 3 27 ratio BQ Transmission 3 55 ratio HK CORVAIR Automatic Transmission 3 27 ratio BC CORVAIR Positraction 3 89 ratio HL CORVAIR 3 Speed or 4 Speed 3 55 ratio BF CORVAIR Positraction w Automatic CORVAIR Automatic Transmission 3 55 ratio BJ Transmission 3 89 ratio HM CORVAIR 3Speed or 4 Speed 3 89 ratio BL CORVAIR 3 or 4 Sp ed 3 89 ratio HE CORVAI R Automatic Transmission 3 89 ratio BY CORVAIR Automatic Transmission R10 3 Speed or 4Speed 3 89 ratio BL 3 89 ratio HF R10 Automatic Transmission 3 89 ratio BY R10 Positraction 3 89 ratio HL R10 Positraction w Automatic Transmission 3 89 ratio HM R10 3 or 4Speed 3 89 ratio HE 1962 r 1964 CORVAIR 3 or 4 Speed 3 27 ratio HA CORVAIR 3 or 4 Speed 3 55 ratio HB CORVAI R Automatic Transmission 3 27 ratio HC CORVAIR 3 or 4 Speed 3 27 ratio HA CORVAIR Automatic Transmission 3 55 ratio HD CORVAIR 3 or 4 Speed 3 55 ratio HB CORVAIR Positraction 3 27 ratio HG CORVAIR Automatic Transmission CORVAI R Positraction w Automatic 3 27 ratio HC Transmission 3 27 ratio HH CORVAIR Automatic Transmission CORVAIR Positraction 3 55 ratio HJ 3 55 ratio HD CORVAIR Positraction w Automatic CORVAIR Positraction 3 27 ratio HG Transmission 3 55 ratio HK CORVAIR Positraction w Automatic CORVAIR Positraction 3 89 ratio HL Transmission 3 27 ratio HH CORVAIR Positraction w Automatic CORVAIR Positraction 3 55 ratio HJ Transmission 3 89 ratio HM CORVAIR Positraction w Automatic CORVAI R 3 or 4 Speed 3 89 ratio HE Transmission 3 55 ratio HK CORVAIR Automatic Transmission 3 89 ratio HF R10 3 or 4Speed 3 55 ratio HQ R10 Positraction 3 89 ratio S HL R10 Positraction 3 55 ratio HR R10 Positraction w Auto Trans R10 Automatic Transmission 3 89 ratio HM 3 55 ratio HS x R10 3 or 4 Speed 3 89 ratio 4 HE R10 V Positraction w Automatic O R10 Auto Trans 3 89 ratio HF Transmission 3 55 ratio HT 1969 CHEVROLET MOTOR DIVlSlON GENERAL MOTORS CORPORATION P A 30C 10