1960 64 REAR AXLE IDENTIFICATION Series Type Designation Series Type Designation 1960 1962 64 Cont CORVAIR 3 Speed 3 55 ratio BT CHEVY 3 Speed 4 cyl CORVAIR 3 Speed 3 89 ratio BR 3 55 ratio DC CORVAIR Automatic Transmission CHEVY Positraction 4 cyl 3 55 ratio BU 3 55 ratio DD CORVAIR Automatic Transmission CHEVY Positraction 3 36 ratio DE 3 89 ratio BS CHEVY Positraction 3 08 ratio DF CHEVY Positraction b cyl 3 08 ratio DH 1961 CHEVY w Metallic Brakes 3 08 ratio DJ CORVAIR 3 Speed or 4 Speed CHEVY Positnaction w Metallic 3 27 ratio BQ Brakes 3 08 ratio DK CORVAIR Automatic Transmission CHEVY w Metallic Brakes 3 27 ratio BC 3 36 ratio DL CORVAIR 3 Speed or 4 Speed CHEVY Positraction w Metallic 3 55 ratio BF Brakes 3 36 ratio DM CORVAIR Automatic Transmission CHEVY 4 cyl w Metallic Brakes 3 55 ratio BJ 3 55 ratio DN CORVAIR RIO 3 Speed or 4 Speed CHEVY 4 cyl Positraction 3 89 ratio BL w Metallic Brakes CORVAIR RIO Automatic Transmission 3 55 ratio DP 3 89 ratio BY CHEVELLE 3 or 4 Speed 3 08 ratio LA YA ZA CHEVELLE 3 or 4 Speed 1961 64 3 36 ratio LB YB ZB CHEVELLE w Metallic Brakes CORVAIR 3 or 4 Speed 3 27 ratio HA 3 08 ratio LC CORVAIR 3 or 4 Speed 3 55 ratio HB CHEVELLE w Metallic Brakes CORVAIR Automatic Transmission 3 36 ratio LD 3 27 ratio HC CHEVEILE Positraction CORVAIR Automatic Transmission 3 08 ratio LG YG ZG 3 55 ratio HD CHEVELLE Positraction CORVAIR Positraction 3 27 ratio HG 3 36 ratio LH YH ZH CORVAIR Positraction w Automotic CHEVELLE Positraction w Metallic Transmission 3 27 ratio HH Brakes 3 08 ratio LE CORVAIR Positraction 3 55 ratio HJ CHEVELLE Positraction w Metallic CORVAIR Positraction w Automatic Brakes 3 36 ratio LF Transmission 3 55 ratio HK CORVAIR Positraction 3 08 ratio HP NOTE 1964 models only CORVAIR 3 or 4 Speed 3 08 ratio HU CORVAIR Automatic Transmission 3 08 ratio HW On Corvair models the rear axle number is stamped CORVAIR 3 or 4 Speed on lower left side of differential casting w C A C 3 27 ratio HV CORVAIR Positraction w Automatic On Chevy I models the rear axle number is Transmission 3 08 ratio HX stamped on front right side of differential carrier CORVAIR RIO Positraction 3 89 ratio HL CORVAIR RIO Positraction w Automatic On Chevelle models the rear axle number is Transmission 3 89 ratio HM stamped on the bottom flange of the carrier CORVAIR R10 3 or 4 Speed 3 89 ratio HE housing CORVAIR RIO Automatic Transmission 3 89 ratio HF The four digit number following the type RIO 3 or 4 Speed 3 55 ratio HQ designation will designate the date produced RIO Positraction 3 55 ratio HR RIO Automatic Transmission 3 55 ratio HS EXAMPLE HU 0212 RIO Positraction w Automatic Transmission 3 55 ratio HT HU 02 12 CHEVY 3 Speed Automatic Transmission 3 36 ratio DA CHEVY 3 08 ratio DB CORVAIR 3 08 ratio February Day ABBREVIATIONS A C Gen Alternating Current Generator A T Automatic Transmission C A C Car Air Conditioning C C Comfort and Convenience Equipment F C Forward Control Models H Per High Performance Engine STD Standard R 1963