F 450 4WD Super Duty V10-6.8L VIN S (1999)
Fluid - Differential: Fluid Type Specifications
Front
Front Differential Fluid Type
Dana 60 Axle .......................................................................................................................................................... Motorcraft SAE 75W90 Axle Lubricant
Rear
Rear Differential Fluid Type
Dana 80 Axle .................................................................................................................................. Motorcraft SAE 75W90 Synthetic Rear Axle Lubricant