This SUV was a popular one known for its ruggedness off-road capability and comfort. While opinions on the "best" feature can vary depending on individual preferences one standout feature of the 1998 Jeep Grand Cherokee is its renowned 4-wheel drive (4WD) system The Quadra-Drive 4WD system available on certain trim levels of the 1998 Grand Cherokee was particularly notable for its ability to provide exceptional traction in various driving conditions including off-road terrain snow mud and sand. This system utilized advanced technology to automatically transfer power between the wheels with the most traction ensuring optimal grip and stability. Key highlights of the Quadra-Drive 4WD system include: 1. Full-time 4WD: this means that the system is always active and continuously adjusted power distribution to each wheel as needed enhancing traction and control in all driving situations. 2. Vari-lok axles: which utilized progressive gearing to distribute power between the front and rear axles as well as between the left and right wheels on each axle. This allows it to maintain traction even if one wheel lost grip improving overall off-road performance. 3. Selec-trac transfer case: some models of the 1998 Grand Cherokee came equipped with this function which allowed drivers to manually select different drive modes including 4WD high-range for everyday driving and 4WD low-range for more challenging off-road conditions. 4. Enhanced off-road capability: with Quadra-Drive it's capable of tackling rough terrain with confidence thanks to its ability to deliver power to the wheels with the most traction. This made it a popular choice for outdoor enthusiasts and off-road adventurers.