Drivetrain› Differentials and Rear-End Components

OX Locker

Dana 30 Selectable Locking Differential for 3.55 and Lower

$1,208.90

SKU: D30-355-30

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Advanced — 4+ hours

Overview

The OX Locker is a locking differential designed for Dana 30 axles utilizing a 3.55 or numerically lower gear ratio and 30-spline axles. This heavy-duty traction aid provides selectable locking capabilities to help navigate challenging off-road terrain, with a heavy-duty cover included.
Show original supplier description
The OX Locker is a selectable locking differential engineered to provide maximum traction for off-road and 4x4 vehicles equipped with Dana 30 front axles. It is specifically configured for gear ratios of 3.55 and numerically lower, and it requires the use of 30-spline axle shafts. The unit allows drivers to engage the locker only when necessary for better control in difficult conditions. Installation of the differential includes a heavy-duty cover to protect internal components. Users may choose between manual, air, or electric shifting methods, which are sold separately and allow for independent control of front and rear lockers directly from the driver seat. This locker is compatible with a wide range of Jeep models spanning from 1971 to 2018 that feature the 30-spline Dana 30 front axle assembly. It is important to select the appropriate shifting system and cable length for your specific vehicle setup.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandOX Locker
Part NumberD30-355-30
CategoryDrivetrain
5,000+ Trusted brands
1M+ Enthusiasts
5M+ Parts sold
(760) 282-4645 hello@motormia.co

Buy with Confidence

Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy

Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

View Full Shipping Policy