Transmission repair chain AAMCO is a company that specializes in the repair and maintenance of transmissions. It has been in business since 1957 and has grown to become one of the largest transmission repair chains in the United States. AAMCO offers a wide range of services, including transmission repair, transmission rebuilds, transmission fluid changes, and transmission diagnostics. They also provide a variety of other automotive services, such as oil changes, brake repairs, and engine tune-ups. AAMCO is committed to providing quality service and customer satisfaction.