NITRO Lunch Box Lockers - JustDifferentials.com

Nitro's Lunch Box Lockers are fully automatic. When the wheels need to differentiate in a turn (the outside wheel needs to rotate faster to complete the turn) the internal gears on the Lunch Box Locker will remain locked under acceleration. For the gears to overrun each other and allow this differentiation the vehicle must be turning and decelerating naturally. Any load created by acceleration will automatically lock the Lunch box Locker again.

Check them all out below:


Lunch Box Lockers replace the internal spider gears of an open differential only, they will not work inside limited slip carriers. If you have a limited slip and are interested in a lunchbox locker contact us, we have open carriers for most axle applications available.

If you have any questions or can't find the locker you need, give us a call at 866 349 6801 or email us at: [email protected]

Here's a video talking about the Nitro Lunch Box lockers in an older full size Wagoneer. If you have any questions about how the Lunch Box Lockers operate, check it out. You can always call us at 866 349 6801 or email us at [email protected] if you have need help ordering of have any additional questions.

Nitro Lunch Box Locker video

We keep tons of NITRO Lunch Box Lockers on the shelves, give us a call at 866 349 6801, email us at [email protected] or shop online with the link below:

NITRO Lunch Box Lockers​

Whats the difference between a Mechanical Locker and a Selectable Locker?

Mechanical Lockers:
(Detroit, NITRO Lunch Box, Powertrax, Lock Right)
Mechanical lockers engage automatically when force is applied to the differential via the pinion and ring gear. While force is not actively being applied, springs in the locker allow the mechanism to disengage. That is to say that when you press on the gas it locks up, when you let off the gas and turn it unlocks.
Mechanical lockers are well know for the popping and clanking noises they make when engaging and disengaging.
Mechanical lockers can be installed in front differentials but you must have lock out hubs and they MUST be unlocked for on-road driving because of steering issues.

Selectable Locker:
(ARB, TJM, OX, Auburn ECTED, Eaton E-Locker)
Selectable lockers fall into 3 categories - air, electric and manual.
Air lockers use compressed air from a vehicle-mounted air compressor to engage the locking mechanism.
Electric lockers use an electrical pulse to engage a magnetic locking device.
Manual lockers (OX) must be engaged by pulling a cord, usually requiring the driver to exit the vehicle (although many OX can be upgraded to electric).
Air and electric lockers can be activated by a switch inside the vehicle.
Selectable lockers are fully locked when engaged and function as an open differential when not engaged.
Some electric lockers function as a limited-slip differential when not engaged.


We want you to always have the right differential for your application. If you have any questions about what you need give us a call at 866 349 6801 or email us at [email protected] and we will help you out! You can find all our lockers by following the link below:

Looking for the best bang for your buck when purchasing a locker? NITRO Lunch Box Lockers are inexpensive, durable, easy to install, and we have them in stock! You can shop online with the link below, or call us at 866 349 6801 if you have any questions or can't find the locker you are looking for. If a Lunch Box Locker isn't what you're looking for, we have tons of other differentials in stock as well!

Lunchbox lockers are inexpensive and effective. If you have any questions about them please email us at [email protected] or call us at 866 349 6801.