* Use the cruise control. Most Mack trucks have a cruise control feature that can be used to set a maximum speed for the truck. To disable the speed limiter, simply turn off the cruise control.
* Modify the ECM. The engine control module (ECM) is the computer that controls the engine and transmission. By modifying the ECM, it is possible to disable the speed limiter. However, this can be a complex and time-consuming process, and it may void the truck's warranty.
* Install an aftermarket speed limiter bypass kit. There are several aftermarket companies that sell speed limiter bypass kits for Mack trucks. These kits typically involve installing a device that intercepts the signal from the speed sensor and sends a false signal to the ECM. This can trick the ECM into thinking that the truck is traveling at a lower speed than it actually is, and the speed limiter will be disabled.
WARNING: Disabling the speed limiter on a truck can be dangerous. It is important to only do this if you are aware of the risks and you are comfortable with the modifications you are making. By disabling the speed limiter, you are increasing the risk of an accident. You may also void your truck's warranty.
