Early 1971 Jeep vehicles were available with an optional power take-off unit. The PTO consists of four assemblies:
- The shift unit, mounted on the transfer case.
- The driveshaft and U-joints.
- The shaft drive assembly.
- The pulley drive assembly.
The shaft drive exits the rear of the vehicle and is designed to operate trailed equipment. The pulley drive is driven by the shaft drive and is designed to operate stationary equipment by a belt drive. The shaft drive assembly was installed far more frequently than was the pulley drive assembly.