This is the Motorcraft XL3 rear axle additive friction modifier used on many Ford applications. Check your owner's manual and/or the rear axle assembly if needed. Part number is XL-3. This is sold by the single 4 ounce bottle. Shipping options and cost is based on your zip code and will show the amount once placed in the shopping cart using the shipping estimator.
Rear axle fluids guide chart on our Reference info page.