Lunchbox lockers are not a singular component you swap in, but a collection of parts that converts an open differential carrier (and only an open differential carrier) into a mechanical locker. Just as you can put a different kind of meal in your lunchbox, the lunchbox locker allows different internals to be put in your differential… the internals being the lunch and the differential carrier being the box portion of the equation. The lunchbox locker name is a loose reference to that handy mid-day meal carrier we all know and love. This ratcheting sound can be loud and is why mechanical units may not be best suited for vehicles that spend a lot of time on the street… it all depends on how sensitive your ears are. When the vehicle turns and the two wheels on the axle turn at different speeds, the unit makes a clicking sound as the square-cut side gears move over and past one another. Off-throttle situations, where the diff is unloaded, leads to a partially unlocked unit. In mechanical lockers, also called automatic lockers, on-throttle driving conditions, where load is applied to the differential, induces locking. The Spartan Locker is flanked by a Yukon Grizzly Locker (left) and a Yukon Zip Locker (right). The Yukon Zip Locker is an air locker or selectable locker that uses a pneumatic system for actuation.
The Spartan Locker and Yukon Grizzly Locker are mechanical. A mechanical locker is always active, providing traction 24/7.
What are the Different Types of Lockers?Ī selectable locker is an on-demand unit that the driver activates electronically or pneumatically via a cockpit-mounted button. Lockers come in two flavors… selectable or mechanical. A locker physically joins the drive axles together so they deliver an equal amount of torque to each tire, regardless of available traction.
The Spartan Locker, USA Standard Gear’s lunchbox locker, provides game-changing traction at a low cost.
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