Rear Diff fluid capacity?

[GOPDiesel]

My owners manual does not give the fluid capacity? Does anyone know how much synthetic 75/140 it takes? I know I can pour it in until it overflows but would like to have enough on hand.

Thanks, Pat

[Rccarps2]

Rear Axle Fluid Capacity Specifications


10.50 inch Ring Gear 6.9 Pints ( 3.3 L ) *

Dana 80


Conventional and Truetrac 8.5 Pints ( 4.0 L ) *

Trac-Lok 8.0 Pints ( 3.8 L ) *

Dana S110 and S130 14 Pints ( 6.6 L ) *

* NOTE: Add 8 oz. (236 ml) of Additive Friction Modifier XL-3 or equivalent meeting Ford Specification EST-M2C118-A for complete refill of limited slip Ford axles. Ford design rear axles contain a synthetic lubricant that does not require changing unless the axle has been submerged in water.

[expertrider]

You also have to change it if it's leaking. Mine was doing this.
Anyone changing the rear diff oil should buy the 08 cover. It's much better and keeps the oil cooler.

[GOPDiesel]

Thanks for the responses. Too bad sythetic diff oil is so expensive!