Dana 30 Lunchbox Locker (Aussie / Lock-Right / Powertrax)
Drop-in automatic locker that replaces the spider gears in the stock carrier. Cheap, no setup, but always-engaged behavior makes the front squirrelly on pavement.
A "lunchbox" locker is an automatic locker that drops into the existing factory differential carrier — you remove the spider gears and replace them with the locker assembly. No carrier replacement, no backlash setting, no bearing pre-load to mess with. Two hours in the driveway.
The XJ Dana 30 has three popular lunchbox lockers:
- Powertrax Lock-Right: $280, the classic. Plastic ratcheting cams.
- Aussie Locker: $260, similar design to Lock-Right, often considered slightly more refined.
- Powertrax No-Slip: $400, a quieter ratcheting design (less clunking on cornering).
How it works: the locker is locked under power (both wheels driving) and ratchets/unlocks when one wheel turns faster than the other (cornering or coasting). This means on tight corners under throttle, the inside wheel can chirp/skip. In the FRONT axle, this is more pronounced because cornering forces are higher; the rig will pull and the inside front tire will chirp.
For a daily-driven XJ, a lunchbox in the FRONT can be annoying. Many builders run a lunchbox in the rear and an ARB or open in the front. For a trail-only or dedicated rock crawler, a front lunchbox is fine.
Install: requires pulling axle shafts and removing the differential carrier from the housing. Remove spider gears, drop in lunchbox, reinstall carrier. Pretty straightforward for someone with mechanical experience; a tech video helps.
Why it works
- Cheap
- No setup required
- Drop-in install
- Strong locking force
Trade-offs
- Always engaged behavior
- Squirrelly on pavement (front)
- Tire chirp in corners
- Clunking noise
Tools required
- differential bearing puller (light duty)
- metric sockets
- torque wrench
- drain pan
Parts
| Part | Vendor | Est. price |
|---|---|---|
| Powertrax Lock-Right D30 27-spline | Powertrax | ~$280 |
| Aussie Locker D30 | Aussie Locker | ~$260 |
| Powertrax No-Slip D30 | Powertrax | ~$400 |
Sources
Related
Written and maintained by an AZ wheeler and driveway wrencher. How we source guides. Always cross-reference your factory service manual — modifications affect vehicle safety and warranty. Work at your own risk.