Dana 35 ARB Air Locker
ARB makes an air locker for the D35 (RD120 for 3.55 carrier break, RD121 for 3.73+). Premium locker for a weak axle — usually skip and swap the axle instead.
ARB makes an Air Locker for the Dana 35: RD120 for low carrier (3.07-3.54) and RD121 for high carrier (3.73-up). Same operation as other ARBs — selectable, air-engaged, open differential when disengaged.
The question is whether it makes sense to put a $800 selectable locker in a $400 weak axle. NAXJA forum consensus says "usually no." If you have $1500 to invest in your XJ's rear differential, that money goes much further toward an 8.8 Explorer swap with built-in disc brakes and 31-spline shafts.
Valid cases for D35 ARB:
- Your XJ has a D35 with a fresh ring/pinion and you don't want to swap.
- You're staying at 31-32" tires and value the selectability for occasional trail use.
- You plan to keep this XJ mostly stock with light trail.
For anyone else: skip the D35 ARB and put your money into an 8.8 swap with an ARB or Detroit locker.
Install: same as other ARBs. Requires diff teardown, carrier replacement, drilling for the air line port, and complete setup with new bearings.
Why it works
- Selectable
- Open differential on road
- Excellent quality
Trade-offs
- Expensive locker in a weak axle
- Money better spent on 8.8 swap
- Doesn't strengthen the D35
Tools required
- differential setup tools
- drill
- torque wrench
- wiring tools
Parts
| Part | Vendor | Est. price |
|---|---|---|
| ARB Air Locker D35 27-spline 3.54 and down | ARB | ~$850 |
| ARB Air Locker D35 27-spline 3.73 and up | ARB | ~$850 |
Sources
Related
- Dana 35 Lunchbox Locker
- Ford 8.8 Explorer Rear Axle Swap (Full Guide)
- All Jeep Cherokee XJ guides & tools
- Browse the full DIY database
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.