AAMCO is a transmission repair franchise that is based out of the United States. It was founded in 1957 in Philadelphia, Pennsylvania and was acquired by American Capital in 2006. Upon American Capital's gaining of AAMCO, the headquarters was shifted from Philadelphia to Horsham, Pennsylvania. In the mid-2000s, AAMCO rebranded their name due to the increased reliability of their automotive transmissions. They took on the name AAMCO Transmissions and Total Car Care. Today, AAMCO is known as the world's largest franchisor of car repair and transmission specialist shops with more than 600 stores in Canada and the United States.