1959-1960 Rear Axle Ratios & Identification 
 
Code Ratio Type Application
AE 3.55:1 Standard Powerglide
AH 3.70:1 Standard Manual Transmission
AN 3.70:1 Positraction Manual Transmission
AP 4.11:1 Positraction Manual Transmission
AQ 4.56:1 Positraction Manual Transmission
AS 3.70:1 Positraction Manual Trans. & H.D. Brakes & Suspension
AT 4.11:1 Positraction Manual Trans. & H.D. Brakes & Suspension
AU 4.56:1 Positraction Manual Trans. & H.D. Brakes & Suspension
FJ 3.70:1 Standard Manual Trans. & Mettalic Brakes 
FK 3.70:1 Positraction Manual Trans. & Mettalic Brakes 
FL 4.11:1 Positraction Manual Trans. & Mettalic Brakes 
FM 4.56:1 Positraction Manual Trans. & Mettalic Brakes