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Will 37-inch tires fit a YJ Wrangler with a 4-inch lift?
Fitment answer · Updated October 27, 2026
Short answer
Not without major work. 37s on a 4-inch YJ hit the fenders and springs; owners who run them cut or replace the fenders, add bump stops and often move to a spring-over or bigger lift. The stock Dana 30 front and Dana 35 rear are weak for 37s.
Shop the gear for this build ↓ Tires, deflators and a compressor picked for this setup.
What you usually need
- Flat fenders or heavy trimming, plus bump stops.
- Wheels with about 3.75-inch backspacing.
- Stronger axles; the Dana 35 rear is a known weak point.
- Driveline and steering work for the added size.
Regearing
37s on a YJ need 5.13 or deeper gears. Compare ratios in the Tire & Gear Calculator before you buy gears.
Compare
Gear for this build
- Mud-terrain tires (search) — Louder on the highway; buy for real mud use.
- Staun tire deflators — Repeatable trail pressures.
- VIAIR 88P portable compressor — Air back up before the highway.
- YUNPEAK 1.26" × 30' kinetic recovery rope — Bigger tires, bigger trails: carry recovery gear.
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FAQ
Do 37s fit a 4-inch YJ?
Not without major work.
Are the stock axles OK?
No, they are weak for 37s.
Do I need to regear?
Yes, 5.13 or deeper.
Check your numbers
Use the free Tire & Gear Calculator to see speedometer error, highway RPM and a regear target, or ask TekJeep AI on the homepage with your year, trim, lift and wheel specs.
Related guides: All-terrain & mud-terrain tires · JK 2.5" lift overview
More fitment answers: 33s on a YJ Wrangler · 35s on a YJ Wrangler · 31s on a stock YJ · 33s on a 2" YJ · 35s on a 4" YJ · 33s on a 4" YJ · 35s on a 2" YJ · 33s on a 3" YJ
Fitment disclaimer: Clearance depends on exact tire size, wheel specs, suspension and how hard you flex. Confirm with your tire shop or installer before buying.
Tire size how-tos: How to read a tire size · Bolt pattern & backspacing · Regearing for bigger tires · Tire pressure after upsizing · Speedometer error · Rubbing fixes