Used transmissions can be purchased online through used auto parts service websites such as UNeedAPart.com, AutoGator.com or BuyUsedEngine.com. Internet auction sites such as eBay also feature various types of used transmissions for sale in different conditions.
UNeedAPart.com offers its users a comprehensive used parts search tool that accesses a network of over 7,000 used parts dealers, as of March 2015. To access the service, a user first chooses the part type she needs, such as a transmission. Next, she selects the make and model of her vehicle, and provides some other identifying information about the part needed to ensure the site has as much information about the user's needs as possible. Once receiving the part request, the site searches within its network of parts dealers and auto salvage yards to locate the part for the customer.
As an auction site, eBay allows users searching for used parts to interact with the sellers directly, as opposed to going through an intermediary. All listings on eBay contain pictures of the item being sold along with detailed descriptions of their condition. Each user selling items on eBay also has a seller rating that is determined by feedback provided by their previous customers, which is helpful for determining a seller's trustworthiness.