Your stock Jeep axles are fine for just about any type of driving, however when you add larger tires, suspension lifts, heavier bumpers, etc., most people opt to upgrade their axles for heavier-duty versions.
Stronger axles, such as Dana 44 and 60, as well as heavier-duty front Dana 30, are designed to accommodate these heavier loads that normally will bend stock axles. Plus, many will come with upgraded gearing to help with larger tires, as well as beefier differential covers to stand up to any off pavement adventure. Some even come with air lockers pre-installed. These full axle kits can be vehicle-year range specific so make sure to find the ones built for your Jeep.
