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Jeep Wrangler Unlimited
LJ, 2004–06

Factory gearing, tires, angles and brakes for the Wrangler Unlimited, and what the usual upgrades do to it. Every number is from the maker's own figures unless the calculators say otherwise. A few figures here are still waiting on a factory document; the calculators mark them.

Use this truck in the calculators
103.4 in wheelbase · 24.4 in front · 38.7 in rear overhang
in
Stock tire30x9.50R1530.0 in tall
Axle ratio3.73–4.11Factory, by trim
Crawl ratio73.3:1Best trim: Unlimited Rubicon (2005-06)
Angles43.1 · 21.4 · 27.7°Approach, breakover, departure
Clearance8.3 inFactory figure
Highway mpg18EPA

Tire upgrades, worked out

Unlimited 4.0L, 3.73s, from 30x9.50R15
TireHeightUnder the diffsSpeedo at 65RPM at 65Gears for dailyOpen
31x10.50R1531.0 in+0.5 in63 mph2,051Keep 3.73sOpen →
32x11.50R1532.0 in+1.0 in61 mph1,9863.91Open →
33x10.50R1533.0 in+1.5 in59 mph1,9264.1Open →
33x12.50R1533.0 in+1.5 in59 mph1,9264.1Open →
35x12.50R1535.0 in+2.5 in56 mph1,8164.3Open →

Stock turns 2,119 rpm at 65 in top gear. Flotation sizes are nominal; most measure a little short mounted.

Trims

2 we have figures for
TrimTireTransmissionAxleAnglesClearanceOpen
Unlimited 4.0L30x9.50R15NV3550 5-speed manual, NSG370 6-speed manual, 42RLE 4-speed automatic3.7343.1 · 21.4 · 27.78.3 inUse →
Unlimited Rubicon (2005-06)LT245/75R16NSG370 6-speed manual, 42RLE 4-speed automatic4.1143.1 · 21.4 · 27.78.3 inUse →

Size

Wheelbase
103.4 in
Front overhang
24.4 in
Rear overhang
38.7 in
Height
70 in
Body
SUV
Stock tires
30x9.50R15, LT245/75R16

Transmissions and low range

NV3550 5-speed manual (4.0L, 2000-04)
4.01 · 2.33 · 1.39 · 1 · 0.78
NSG370 6-speed manual (2005-06)
4.46 · 2.61 · 1.72 · 1.25 · 1 · 0.84
42RLE 4-speed automatic (2003-06)
2.84 · 1.57 · 1 · 0.69
Low range, nv231
2.72:1
Low range, rock-trac (nv241or)
4:1

Axles

Front
Dana 30 (Dana 44 on Unlimited Rubicon)
Rear
Dana 44
3.73 ratio
Unlimited 4.0L
4.11 ratio
Unlimited Rubicon (2005-06)

Brakes

Front rotor
11.00 in, 279 mm
Rear drum
9.00 in, 229 mm
Rear
drum (9.0 x 2.5 in)

Suspension

Front
Quadra-Coil 4-link with track bar, coil springs
Rear
Quadra-Coil 4-link with track bar, coil springs
Rear layout
Factory 4-link

Fuel economy

EPA highway, automatic
18 mpg
EPA highway, manual
18 mpg
Rated years
2004–2006, 4WD

Brake upgrades

What bigger tires need →

Aftermarket bumpers

15 listed

Makers almost never publish angles, bottom heights or how far a bumper tucks, so these fill in as owners measure them. Measured yours? Add it on the rig page and every owner of this Wrangler Unlimited sees how it does on their tires and lift.

Front 7

Rear 8

Every calculator, set up for the Wrangler Unlimited

Tire sizeBigger tires: speedo, clearance, angles and brakes.Compare tiresRegearHighway RPM on every ratio and mpg.Pick your gearsCrawl ratioHow slow it creeps, against other trucks.Work out crawlSpeedometerWhat it really reads on new tires.Fix your speedoLinksAnti-squat and what a lift does to it.Check your linksYour rigBuild sheet and measured angles.Start a build sheetLeaderboardsWhere the Wrangler Unlimited ranks against every stock truck.See where it ranks

Source: s3.amazonaws.com.

Use at your own risk. These calculators are here to help you plan and to inform your decisions, not to sign off on a build. Many numbers are estimates worked out from factory figures, and some factory figures are not yet confirmed. Check every number against your own truck, its manuals and a qualified shop before you buy parts, cut, weld, lift, regear or drive on it. Long Range Desert Tools is not liable for anything you do based on these calculators or their results. The full terms are in our policies.