Front Dana 44 swap for 35"+ tires. JK Rubicon front, WJ HD, or aftermarket crate axles. More complex than rear; steering and bracketry change too.
The XJ front Dana 30 runs out at 33-34" tires with chromoly shafts. For 35s+, the next step is a Dana 44 front. Options:
JK Rubicon Dana 44 front (2007-2018): 30-spline (or 32-spline rear Rubicon outers can be swapped), factory e-locker, disc brakes. ~$1500-2500 from salvage. Wider than XJ stock.
WJ HD Dana 44 (some 5.9 Grand Cherokees): rare but bolt-up similar to ZJ. ~$1200.
Ten Factory crate D44 front: 30-spline, ready-to-bolt-up to XJ coil/control arm/track bar mounts. $3500-5000.
Currie Rock Jock 44: built-to-order, with chromoly shafts, hydraulic ram support, 1-ton bearings. $4500-7000.
Swap requirements:
Coil and control arm mounts: must match XJ geometry. JK D44 has different mounts; aftermarket housings have XJ-spec mounts.
Steering arms: XJ uses Y-link steering with specific knuckle mounts. Some D44 housings work with stock XJ pitman; others require crossover steering.
Track bar mount: must position correctly relative to XJ frame.
Brake lines: hose lengths and adapters needed.
Hub bearings vs unit bearings: JK Rubicon uses unit bearings (cheaper to replace); some aftermarket use spindle/manual hubs.
Width: JK D44 is ~3" wider than XJ stock — need flatter fenders, less backspace wheels, and steering compatibility.
Cost: $1500-3000 for salvage-based swap; $5000-8000 for crate axles. This is a major build expense.
For builds going to 35"+ tires, the front D44 swap is the right answer. For 33"-34" builds, a built D30 with chromoly shafts is usually enough.
Why it works
35"+ tire capable
Factory locker on Rubicon donor
Aftermarket support strong
Trade-offs
Very expensive
Major fab work
Width changes fender requirements
Steering may need crossover
Tools required
MIG welder
metric sockets
torque wrench
differential setup tools
drill
Parts
Part
Vendor
Est. price
JK Rubicon D44 front (salvage)
Salvage yard
~$1800
Ten Factory XJ D44 front crate
Ten Factory
~$3800
Currie Rock Jock 44 front
Currie Enterprises
~$5500
Sources
{'title': 'NAXJA front D44 swap writeup', 'url': 'https://naxja.org/threads/front-d44-swap.901567/'}
Written and maintained by an AZ wheeler and driveway wrencher. Always cross-reference your factory service manual — modifications affect vehicle safety and warranty. Work at your own risk.