* Shift-on-the-fly: These systems allow you to engage 4WD while the vehicle is moving (usually at low speeds). You'll typically find a rotary dial or lever near the gear shifter. The exact location and labeling vary greatly. Common labeling includes 2H (2-wheel high), 4H (4-wheel high), 4L (4-wheel low). To engage 4H, simply rotate or shift the lever to the 4H position. For 4L, you usually need to stop the vehicle completely, then shift.
* Command-Trac/Quadra-Trac: These are Chrysler's names for various systems. Again, the exact method varies by Jeep model and year. Some may use a rotary dial or a lever. Consult your owner's manual.
* Part-time 4WD: These systems are typically only for use on low-traction surfaces (snow, mud, etc.) Using them on dry pavement can cause damage.
* Full-time 4WD: These systems can be used on any surface and automatically adjust power distribution. They usually don't require a manual shift into 4WD.
Crucially: Always consult your Jeep's owner's manual. This is the only definitive source for instructions on engaging 4WD for your specific model. The manual will show you exactly where the controls are located and how to use them safely.
Improperly engaging 4WD can damage your Jeep's drivetrain. Don't rely on online information alone. Find your owner's manual!
