Operation CHARM: Car repair manuals for everyone.

With Ford Axles

TYPE & VISCOSITY
To determine if a differential is a standard type or a limited-slip type, check axle code listed on label on door lock pillar. Standard Axle Codes -- consist of TWO NUMBERS Limited-Slip Axle Codes -- will consist of ONE LETTER and ONE NUMBER
Standard
Ford part number F1TZ-19580-B
Synthetic 75W-140
Limited Slip
Ford part number F1TZ-19580-B. Add 4 oz of Additive/Friction Modifier.
Synthetic 75W-140
CAPACITY
Fill no higher than 1/4 inch to 9/16 inch below fill plug. The differentials with the 8.8 inch and the 10.25 inch ring gears have a removable cover; the differential with the 9.25 inch ring gear does not.
With 8.8 & 9.75 Inch Ring Gears 5.5 Pint (US) (pt (US))
With 10.25 Inch Ring Gear 7.5 Pint (US) (pt (US))
Friction Modifier C8AZ-19B956-A 4 Ounce (US) (oz (US))