The Ford L-series (also named Ford Louisville or, for the 1990s aerodynamic models, Ford Aeromax) is a range of heavy-duty trucks that were assembled and marketed by Ford between 1970 and 1998. Ford had been producing their "Heavy Duty" trucks since 1948 and their "Super Duty" lineup since 1958 marketed by various GVW ratings. Truck weight classifications 1-8 were a new concept brought about by the DOT National Highway Administration. The first dedicated Class 8 truck produced by the company, the L-series range replaced the F-series "Super Duty" and N-series (short conventional derived from the F-series). Produced as both straight trucks and semitractors, the Ford L-series encompassed a wide range of models through the Class 6-8 GVWR ratings in medium-duty, severe-service, and vocational applications. The line would become one of the most popular series of trucks Ford ever produced.
The L series was produced in the Kentucky Truck Plant near Louisville, Kentucky, which gave rise to the nickname "Louisville Line" trucks; as part of a 1996 redesign, part of the model line officially took on the Louisville nameplate.
Following the sale of the Ford heavy-truck line to Freightliner in 1996, the L-series was discontinued by Ford at the end of 1998. Freightliner would concurrently take over production of the Ford L-series, opening its Sterling Trucks subsidiary; the L-series became the Sterling A line, Acterra, and L line, remaining in production until 2009 when Sterling Trucks closed operations. FROM WIKIPEDIA.