1955 2nd Ser 63 REAR AXLE IDENTIFICATION Axle identification is stamped on differential carrier along with date of manufacture Plant Identlhcatian 19 5 5 5 8 Series Type G A Bulfalo CORVETTE Powerglide AE CORVETTE 3 or 4 Speed w Positraction 3 70 ratio AN PASS 3 Speed AA BA CORVETTE 3or 4 Speed w Positraction 4 11 ratio AP PASS Automatic Transmission AB BB CORVETTE 3or 4 Speed w Positraction 4 56 ratio AQ PASS Overdrive AC BC CORVETTE 3 or 4 Speed w H D Brake Susp and PASS 3 Spd w Positraction 3 55 ratio AK Positraction 3 70 ratio AS PASS Overdrive w Positraction 4 11 ratio AL CORVETTE 3 or 4 Speed w H D Brake Susp and PASS A T w Positraction 3 36 ratio ANI Positraction 4 11 ratio AT CORVETTE 3 Speed AH CORVETTE 3 or 4 Speed w H D Brake Susp and CORVETTE Powerglide AE Positraction 4 56 ratio AV CORVETTET 3 Speed w 3 27 ratio AD CORVETTE 3 or 4 Speed w Metallic Brakes FJ CORVETTE 3 Speed w 4 11 ratio AJ CORVETTE 3or 4 Speed w Positraction and Metallic CORVETTE 3 Speed w Positraction 3 70 ratio AN Brakes 3 70 ratio FK CORVETTE 3 Speed w Positraction 4 11 ratio AP CORVETTE 3or 4 Speed w Positraction and Metallic CORVETTE 3 Speed w Positraction 4 56 ratio AQ Brakes 4 11 ratio FL CORVETTE Hvy Duty Brake 8i Suspension CORVETTE 3 or 4 Speed w Positraction and Metallic w Positraction 3 70 ratio AS Brakes 4 56 ratio FM CORVETTE Hvy Duty Brake 81 Suspension 31 3200 All 3 90 ratio AF w Positraction 4 11 ratio AT 31 3200 All 3 70 ratio A1 CORVETTE Hvy Duty Brake gl Suspension 310304 05 w Positraction 4 56 ratio AU 06 16 4 Wheel Drive 3 90 ratio AR 31 3200 All 3 90 Ratio AF 31 3200 All 3 38 ratio AY 31 3200 Overdrive 4 11 Ratio AG 34 35 3700 3 Spd 5 14 ratio CA 34 35 3700 3 Speed 5 14 Ratio CA 34 35 37 34 35 37 3800 Dual Wheels 5 14 ratio CB 3800 Dual Wheels 5 14 Ratio CB 34 35 3700 3 Spd H D 4 Spd H T 5 14 ratio CE 34 35 3700 3 Spd H D 4 Spd H T 5 14 Ratio CE 34 35 3700 14 Brake 5 14 ratio CF 34 35 37 3600 All 4 57 ratio CC 3800 14 Brake 5 14 Ratio CF 3600 6 50 16 7 17 5 6 ply 4 57 ratio CD 3600 All 4 57 Ratio CC 3603 04 09 4 Wheel Drive 4 57 ratio CP 3600 Dual Wheels 4 57 Ratio CD 3800 All 5 14 ratio CF 3103 04 05 3803 04 05 06 16 4 Wheel Drive 3 90 Ratio AR 09 4 Wheel Drive 5 14 ratio CQ 3603 04 09 4 Wheel Drive 4 57 Ratio CP 3803 04 09 4 Wheel Drive 5 14 Ratio CQ 31 3200 3 90 Ratio Alt NOTE 1957 1958 only 6 O TNOTE 1958 only PASS 3 Speed 6 cyl 3 55 ratio PASS Powerglide 348 AA BA PASS 3 Speed 8 cyl 3 36 ratio 19 5 9 PASS Powerglide 6 cyl AB BB PASS Overdrive 3 70 ratio PASS 3 Speed AA BA PASS 4 Speed 348 w H Per FE BE PASS Automatic Transmission AB BB PASS 3 Speed 6 cyl w Taxi Equip PASS Overdrive 4 11 ratio AC BC 3 55 ratio AG BG PASS Overdrive 3 70 ratio FE BE PASS Powerglide 6 cyl w Taxi Equip PASS 3 Spd w Positraction 3 55 ratio AK BK 3 36 ratio PASS Overdrive w Positraction 4 11 ratio AL Bl PASS 3 Speed 283 w Taxi Equip AD BD PASS A T w Positraction 3 36 ratio AM BM PASS Powerglide 8 cyl w Taxi Equip PASS Overdrive w Positraction 3 70 ratio FH BH 3 08 ratio AZ BZ PASS A T w 348 3 08 ratio AW BW PASS 3 Speed w Positraction 3 55 ratio AK BK PASS Positraction w 348 3 08 ratio AX BX PASS Positraction 3 36 ratio AM BM CORVETTE 3 Speed or 4 Speed AH PASS Positraction 3 70 ratio FH BH 1 62 20 G E m a iti