For both types: Always engage 4WD on a low-traction surface, such as gravel, dirt, or snow. Never engage 4WD on dry pavement at speed. Doing so can cause damage to your drivetrain.
Manual Transfer Case:
1. Bring the vehicle to a complete stop.
2. Shift the transmission into neutral.
3. Locate the transfer case lever. This is usually located on the floor, near the shifter.
4. Move the transfer case lever to the "4H" (4-wheel High) position. This engages 4WD for normal off-road driving.
5. To engage "4L" (4-wheel Low) for extreme off-roading or low-speed situations, move the transfer case lever to the "N" (Neutral) position first, then to "4L." Low range drastically reduces speed but increases torque.
6. Once finished, return the lever to "2H" (2-wheel High) when driving on paved surfaces.
Automatic Transfer Case (Command-Trac):
The '88 Wrangler likely doesn't have an automatic transfer case, these were more common in later models. However, if it does, it'll have a switch or dial instead of a lever. The operation is generally simpler:
1. Bring the vehicle to a complete stop.
2. Shift the transmission into neutral (or park).
3. Engage 4WD using the switch or dial. It will likely clearly indicate 4H and 4L options.
4. Once finished, disengage 4WD when driving on paved surfaces.
Important Considerations:
* Consult your owner's manual: This is the definitive guide for your specific Jeep Wrangler model.
* Listen for unusual noises: If you hear grinding or binding noises while engaging or driving in 4WD, immediately stop and investigate. Something might be wrong.
* Practice: Get comfortable engaging and disengaging 4WD in a safe, off-road environment before needing it in an emergency.
If you're unsure about any part of this process, it's best to seek assistance from a mechanic experienced with classic Jeeps. Improper 4WD engagement can damage your vehicle's drivetrain.
