9902.17.04 - 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)

This HTS category, 9902.17.04, specifically covers differentials designed for vehicles classified under heading 8703, which typically includes passenger motor vehicles and other vehicles principally designed for the transport of persons. The key distinguishing features of these differentials are their integrated components: a self-contained silicone-fluid filled reservoir, a shear pump, and a progressively-locking clutch pack. These specialized differentials are subject to temporary legislation and modifications, as indicated by their placement within Chapter 99.

It is crucial to note that this classification explicitly excludes differentials intended for tractors, with the exception of road tractors. This distinction is vital for accurate customs processing, ensuring that these sophisticated differential systems for passenger vehicles are not misclassified with components for agricultural or heavy-duty machinery. The parent context of Section XXII, "Special Classification Provisions," highlights that such items may be subject to specific trade agreements or temporary import restrictions, necessitating careful adherence to the stated provisos.

As a leaf node within the HTS database, this category does not have further subdivisions. Therefore, classification under 9902.17.04 depends solely on meeting the detailed description of the differential's function and its intended application for vehicles of heading 8703, while strictly excluding those specified for other types of vehicles. The "provided for in subheading 8708.50.89" parenthetical reference further guides the importer or exporter to a specific baseline classification before the temporary or special provision applies.