* Selec-Trac: This system has a rotary dial, usually located on the center console, with positions like 2H (2-wheel high), 4H (4-wheel high), and N (neutral). To engage 4H (4-wheel high), simply rotate the dial to the 4H position. This should only be done while moving at low speeds (under 55 mph). Never switch into 4H while stopped, especially on pavement.
* Quadra-Trac: This system is fully automatic. You don't have a dial to manually select 4WD. The system automatically engages 4-wheel drive as needed based on wheel slippage. It will primarily operate in 2WD unless wheelspin is detected.
To determine which system you have:
1. Look at the transfer case shifter: If you see a rotary dial, you have Selec-Trac. If there's no dial, it's likely Quadra-Trac.
2. Check your owner's manual: This is the most definitive way to identify your 4WD system and understand its operation.
Important Considerations:
* Driving on dry pavement in 4H: Driving in 4H on dry pavement can cause damage to your drivetrain due to binding. It's crucial to only use 4H on slippery surfaces like snow, ice, mud, or gravel.
* 4L (4-wheel low): Both systems might also offer a 4L (4-wheel low) setting, used for extreme off-road conditions and very low speeds. This is generally only used when absolutely necessary and typically requires the vehicle to be stopped before engaging it.
Always consult your owner's manual for specific instructions and safety precautions related to your Jeep Grand Cherokee's 4WD system.
