* Command-Trac (Part-time 4WD): This system is generally engaged by a lever or rotary dial. You *must* be going very slowly (ideally stopped) or at very low speeds on a slippery surface to engage 4WD. Engaging it on dry pavement at higher speeds can damage the drivetrain. The instructions will be in your owner's manual, but generally involve shifting the lever to 4HI or 4LO (high range or low range, respectively).
* Selec-Trac (Full-time 4WD): This system allows for full-time 4WD operation, meaning you can use it on dry pavement. It typically uses a rotary dial or electronic controls to select between different modes, such as 2WD, 4WD Auto, 4WD Full-Time, and Neutral. Again, consult your owner's manual for the correct procedure.
* Quadra-Trac (Full-time 4WD): Similar to Selec-Trac, Quadra-Trac systems offer automatic and manual modes. The specifics of switching between modes vary depending on the exact system. The owner's manual is crucial here.
* Quadra-Trac II/Quadra-Drive I/II: These are more advanced systems and generally have electronic controls. They often automatically engage 4WD as needed, but also offer manual selections via buttons or a dial. Always consult your owner's manual.
The most important "trick" is to:
* Consult your owner's manual. This is not optional. The exact procedure, including proper speeds, terrain conditions, and safety precautions, is explicitly detailed there. Failing to follow the instructions can lead to damage to your vehicle.
* Understand the limitations of your system. Part-time 4WD systems (Command-Trac) are not meant for everyday driving on dry pavement.
In short, there are no sneaky shortcuts. Proper engagement of your Jeep Cherokee's 4WD system requires understanding your specific system and following the manufacturer's instructions.
