Stepping up from 8.8: a Dana 44 rear (TJ Rubicon donor, ZJ V8, or aftermarket crate) for 35"+ tire builds. Heavier duty than 8.8 but more $$ and rarer donors.
Above the Ford 8.8 in capability sits the Dana 44 rear. Several donor options:
Swap requirements similar to 8.8: weld on XJ-spec spring perches, address brake lines, address driveshaft, set width.
Width: TJ Rubicon D44 is ~3" wider than stock XJ — you'll need wheels with less backspace or run wider fenders. ZJ D44 is closer to XJ width.
For most XJ builders, the 8.8 is enough strength up to 35s. The D44 rear becomes the right choice if: you're running 37s, you have a high-torque engine swap (5.3 LS, 4.6/5.0/5.7 Hemi, etc.), or you're doing competitive rock crawling.
Front D44 swap is even more involved (steering, axle housings, brake hardware all change). See separate entry.
| Part | Vendor | Est. price |
|---|---|---|
| TJ Rubicon Dana 44 (salvage) | Salvage yard | ~$1400 |
| Currie crate D44 rear | Currie Enterprises | ~$3500 |
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.
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