Check the differential lubricant level Ford F150
Note: Make sure the vehicle is on level ground for the check.
1. The differential has a check/fill plug which must be removed to check the lubricant level. If the vehicle is raised to gain access to the plug, be sure to support it safely on jackstands — DO NOT crawl under the vehicle when it’s supported only by the jack!
The check/fill plug is located at the right-front of the differential housing (plug locations may vary by model, but will generally be at the same height)
2. Remove the check/fill plug from the differential.
3. Use your finger as a dipstick to make sure the lubricant level is 1/4 to 9/16-inch within the bottom of the plug hole. If not, use a syringe to add the recommended lubricant until it just starts to run out of the opening. On some models a tag is located in the area of the plug which gives information regarding lubricant type, particularly on models equipped with a Traction Lok differential.
4. Install the plug and tighten it securely.