Ensure your semi truck is Ready for the Road Ahead™ with a seamless transfer of engine power, with the Dayco 54.5" Heavy Duty High Performance Transmission V-Belt. Due to its synthetic rubber, this replacement belt is able to transfer power from the engine to the transmission to enable gear changing and other key functions. Constructed with advanced flexibility to improve airflow and overall belt cooling. FleetPride is your First Click in Heavy Duty®.