Companies in the Transmissions-Truck Tractor Etc industry specialize in repairing and maintaining transmissions for heavy-duty vehicles such as trucks, tractors, and other commercial vehicles. This industry is a subdivision of the Automotive Transmission Repair Shops industry and focuses specifically on the repair and maintenance of transmissions for larger vehicles. The work involved in this industry requires specialized knowledge and expertise in the repair and maintenance of heavy-duty transmissions. Technicians in this industry must be able to diagnose and repair a range of transmission issues, including problems with gears, clutches, and other components. They must also be able to work with a variety of transmission types, including manual, automatic, and semi-automatic transmissions.