How much rear diff fluid does a 2019 F150 hold?
The rear differential on a 2019 Ford F-150 typically holds about 2 quarts on the common 8.8-inch axle and about 3 quarts on the larger 9.75-inch axle; exact capacity depends on the axle type and whether a limited-slip differential is present.
In practice, the precise capacity can vary by model year, trim level, drivetrain (2WD vs. 4WD), and whether your truck uses an open or limited-slip differential. The total fluid capacity refers to the gear oil the housing can contain when filled to the correct level. Always verify the exact specification in the owner's manual or on the axle tag, and use the recommended gear oil with the appropriate friction modifier if your differential is limited-slip.
Rear Axle Options and Oil Capacities
The following list summarizes typical differential capacities by axle type for the 2019 F-150. Exact numbers may vary slightly by configuration.
- 8.8-inch rear axle (common on most 2WD and 4WD models): approximately 2.0 quarts (roughly 1.9–2.1 qt).
- 9.75-inch rear axle (selected heavy‑duty configurations): approximately 3.0 quarts (roughly 2.8–3.2 qt).
Note: The precise capacity for your specific build should be confirmed in the owner’s manual or by checking the axle tag. If your axle is equipped with a limited-slip differential, add the corresponding friction modifier as specified by Ford.
How to check and service the rear differential
When planning maintenance, follow the proper procedure to avoid overfilling or underfilling and to ensure correct oil type for your axle.
- Prepare the vehicle: park on level ground, engage the parking brake, and raise the rear with a jack and stands if needed. Gather the recommended gear oil (often 75W-140 synthetic) and a friction modifier if applicable.
- Access and inspect: locate the fill plug on the differential housing, then remove it to check the current oil level. If the level is low, plan to add oil; if it’s dirty, you’ll need to drain and replace.
- Drain old oil: place a drain pan under the differential, remove the drain plug to drain the old oil completely, then reinstall the drain plug with the proper torque.
- Refill: using a suitable funnel, fill through the fill hole until fluid begins to seep out, indicating the correct level. Reinstall the fill plug and torque to spec.
- Finalize: clean any spills, lower the vehicle, and take a short test drive to distribute the new oil. Recheck the level if needed after cooling.
Always follow Ford’s recommended lubricant specification for your exact axle configuration. The manual provides the definitive guidance on oil type, capacity, and any required modifiers for limited-slip differentials.
Summary
For the 2019 Ford F-150, rear differential capacity hinges on the axle: about 2 quarts for the common 8.8" axle and about 3 quarts for the larger 9.75" axle. Confirm the exact figure for your truck and use the recommended gear oil, including friction modifiers if you have a limited-slip differential. Regularly checking and maintaining the differential helps protect the drivetrain and maintain performance.
