How to Add Gear Fluid to a Ford F150

by Thomas West

The F150 is a half-ton, full-size pickup truck made by the Ford Motor Company. Gear oil is used in the rear axle differential to lubricate the bearings and ring and pinion gears. F150s that are equipped with four-wheel drive also have a front differential that is very similar to the rear. If a leak is detected, the gear oil should be checked. Low fluid level in the differential may cause it to overheat and fail.

Step 1

Crawl under the rear of the vehicle. Locate the differential, which is at the center of the vehicle between the front or rear wheels, depending on which differential you wish to check. (Only four-wheel drive F150s have a front differential.)

Step 2

Locate the threaded plug, which is mounted approximately midway between the top and bottom of the differential at the front.

Step 3

Place the square end of a ratchet wrench into the threaded plug in the differential. Turn the wrench in a counterclockwise direction to loosen and remove the plug. Wipe any oil or metal shavings from the plug with a rag and place it aside.

Step 4

Check the level of oil by sticking a finger into the hole where the plug was removed. Add oil if the level is below the bottom of the hole. Do this by inserting the nozzle of the gear oil container into the hole and squeezing until the fluid is at the correct level.

Step 5

Thread the plug back into the hole and tighten with a ratchet wrench in a clockwise direction. Wipe up any oil spills on the differential with a rag.

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