Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2003 Ford Excursion 7.3 F, 4WDFACTORY OEM SERVICE PROCEDURE

Differential Fluid Capacities

AXLE CAPACITIES

Application

Pts. (L)

Excursion

Front ⁽¹⁾

5.9 (2.8)

Rear ⁽²⁾

6.9 (3.3)

F150 Pickup

Front ⁽¹⁾

3.5-3.7 (1.7-1.8)

Rear

8.8" & 9.75" Ford ⁽²⁾⁽³⁾

5.5 (2.6)

10.25" Ford ⁽⁴⁾⁽²⁾

6.9 (3.3)

F250-550 Pickup

Front ⁽¹⁾

5.9 (2.8)

Rear

Dana S135 ⁽²⁾

24.5 (11.6)

10.5" Ford ⁽⁴⁾⁽²⁾

7.0 (3.3)

11.25" Dana 80 ⁽²⁾

Conventional

8.5 (4.0)

Traction-Lok ⁽⁴⁾

8 (3.8)

⁽¹⁾	80W-90 gear lube.

⁽²⁾	75W-140 synthetic gear lube.

⁽³⁾	Add 4 oz. (118 ml) friction modifier for Traction-Lok axles.

⁽⁴⁾	Add 8 oz. (237 ml) friction modifier for Traction-Lok axles.

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.