Yukon Grizzly Locker Differential for Dana 44 Axles Designed to fit 30 spline axles. Will work on either front or rear axle. Choose proper Grizzly Locker depending on which gear ratio you have. Yukon Gear & Axle Grizzly lockers offer fierce power! These robust lockers are the ultimate mechanical locking differentials, replacing your entire carrier assembly. Yukon Grizzly lockers feature forged cases with 8620 internals and a patent-pending internal locking mechanism for maximum strength. Assembled in the USA, these lockers will provide 100 percent power to both your tires, while still allowing for disengagement while negotiating turns.