4340 Chromoly Front Axle Kit with Grizzly Locker — Dana 30 (TJ, YJ, XJ, ZJ)

Upgrade your Jeep’s front axle to handle bigger tires, higher lifts, and real off‑road punishment without the fear of snapping Drivetrain failures. This 4340 Chromoly Front Axle Kit with Grizzly Locker is purpose‑built to transform a stock Dana 30 into a durable, trail‑ready performance platform for Cherokee XJs, Wrangler TJs, YJs, and Grand Cherokee ZJs.

Why this kit stands out

• 4340 chromoly axle shafts deliver up to 50% more strength than factory, minimizing axle twist and breakages under aggressive wheeling.
• Grizzly Locker included for maximum traction when you’re under load off‑camber or climbing steep, uneven terrain.
• Complete, ready‑to‑install package: inner and outer shafts, U‑joints, axle seals, and disconnect delete kit—all in one box.
• Specifically designed for Dana 30 front axles on XJ, ZJ, TJ, YJ applications—no guessing, just a precise fit.
• 5‑year warranty against manufacturer defects, backed by Magwarehouse as NZ’s official Rough Country importer.

From the trail to the street, this kit redefines how your Jeep handles tough trails. The 30‑spline inner and 27‑spline outer shafts are engineered to distribute loads more evenly, reducing wear and extending axle life when you’re flexed out on rocks or negotiating rutted tracks. The Grizzly Locker locks with confident, decisive traction, helping you power through obstructions without the wheel spin that can trap a stock axle.

What you get and how it helps

• 30 spline inner shafts and 27 spline outer shafts for increased strength where it matters most at the wheel joints.
• U‑joints and seals designed for rugged off‑road duty, reducing the risk of leaks and joint failure under load.
• Disconnect delete kit to simplify the front axle operation and improve reliability in harsh terrain.
• All components are selected for a cohesive upgrade that maintains feel and drivability while delivering real‑world durability.

Ideal for Jeep owners who push performance beyond stock limits—whether you’re running larger tires, a lift, or tackling rocky backcountry trails. This kit is designed for enthusiasts who demand a robust, reliable drivetrain without compromising on daily usability.

Practical tips for use and care

• Pair this upgrade with a quality gear oil and a professional, even‑handed installation to maximize lifespan and smooth operation.
• After installation, inspect spindle seals and U‑joints at regular intervals during the first few off‑road trips to ensure everything stays tight and clean.
• Keep an eye on bolt torques and steering components—upgrades of this magnitude shift overall driveline stresses, so periodic checks are wise.

Magwarehouse — as NZ’s official Rough Country importer — stocks these ready to install, backed by local support. For expert drivetrain advice, call 09 250 1803 or visit our Manukau workshop to ensure your Jeep’s axle upgrade is completed correctly the first time.

Jim‑tested reliability from a trusted name — Magwarehouse brings you a high‑strength, purpose‑built Dana 30 upgrade that keeps pace with real off‑road use, not just bench‑test specs. If you’re serious about conquering rough terrain, this 4340 chromoly front axle kit with Grizzly Locker is the upgrade that makes sense for your TJ, YJ, XJ, or ZJ.