Keeping you Ready for the Road Ahead , the Dorman Basic Heavy Duty Automatic Transmission Shift Lever allows the driver to select and engage different gears, such as "Park," "Reverse," "Neutral," "Drive," and sometimes additional gears like "2" or "1" (used for specific driving conditions, like towing or going down steep grades). Gain control over the vehicle’s movement and speed with the Dorman Heavy Duty I-Shifter replacement. Dorman has a distinguished reputation in the heavy duty truck and trailer aftermarket, manufacturing a variety of parts for a complete repair. Through advanced engineering, Dorman successfully checks into today’s most common failures to figure out the why, ultimately delivering modern solutions that not only match OEM parts, but solve known issues. FleetPride is your First Click in Heavy Duty .