HTS code 9902.17.04 covers "Differentials for vehicles of heading 8703, each incorporating a self-contained silicone-fluid filled reservoir, shear pump and progressively-locking clutch pack, the foregoing other than for tractors (except road tractors) (provided for in subheading 8708.50.89)" under the US Harmonized Tariff Schedule. This is the official duty rate charged by US Customs when this product is imported into the United States, sourced directly from the U.S. International Trade Commission and refreshed daily.