When maximum traction is the priority, an automatic locker is one of the most effective drivetrain upgrades available. This collection features Yukon Grizzly Lockers and automatic locking differentials designed to deliver 100% power to both wheels when traction conditions demand it. Unlike an open differential that allows power to follow the path of least resistance, a locking differential automatically transfers torque to both axle shafts, helping vehicles maintain forward momentum through rocks, mud, loose terrain, steep climbs, and challenging off-road obstacles. Available for popular axle platforms including Dana 30, Dana 44, Dana 60, GM 14-Bolt, GM 8.5", Chrysler 11.5", and Rockwell axles, these lockers are built for serious off-road use and high-load environments.
Automatic lockers are commonly found in rock crawlers, rock bouncers, Ultra4 race cars, trail rigs, mud trucks, overland vehicles, tow rigs, and heavy-duty trucks where dependable traction is critical. Yukon Grizzly Lockers utilize large internal locking teeth, forged cases, and heavy-duty internals designed to withstand shock loads from oversized tires, low-range gearing, and high-horsepower applications. Whether you're upgrading a factory differential, building a dedicated off-road vehicle, or increasing traction for work and recreational use, these locking differentials provide a simple, durable solution that delivers reliable performance without the complexity of air lockers or electronic locker systems.