An ARB Air Locker was the TAD of choice for this front axle. These units have proven to be stout and reliable, and the option to lock and unlock the front axle provides the best combination of locking action with the ability to steer easily when unlocked. Inner axle seals, the ARB, and 5.13 Yukon gears were installed in the freshly-cleaned axle housing. We won't rehash those details here, but will in a separate tech feature. If your budget is tight, simply check the differential for excessive play or other wear issues and leave it be if all looks decent.