Imported automatic transmissions generally require a commercial invoice, packing list, and bill of lading, along with a correct HTS classification. If the transmission contains controlled refrigerants or is part of a vehicle subject to EPA or NHTSA standards, additional documentation may apply. A licensed customs broker can confirm the full entry package for the specific product.

OEM parts shipped as original equipment for vehicle assembly may qualify for different tariff treatment than aftermarket replacement parts, depending on the HTS heading and any applicable trade agreements. The distinction between 'original equipment' and 'replacement' can affect both duty rates and admissibility under certain trade remedy orders.