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When & Why You Should Regear Your Wrangler

Shop Wrangler Gears

Depending on how you use your Jeep, you may want to consider changing out your differential's ring and pinion gears for a set more appropriate to your build. Whether you need the MPGs or the horsepower, and new set of gears can change the attitude of your rig.

Jeep Gears >>

Your Wrangler's gear ratio has an affect on how much torque and horsepower is available to you across the RPM band. Changing your gears shifts the power band forward or backwards, and can compensate for modifications like larger tires.

Extreme Terrain

What Does a New Set of Gears Do?

One of the most common modifications done to Wranglers is installing a lift kit and a larger set of tires. Something many people forget about when they install a larger set of tires is the drivetrain was geared to provide a balance between torque and top speed. When it comes to gear ratios the higher the number the more times the driving member needs to turn. For example, the first gear on an AX-15 transmission has a gear ratio of 3.83:1 and fifth gear has a gear ratio of 0.79:1.

Gears with lower numbers are referred to as taller and higher numbers are referred to as shorter. Taller gearing provides a higher top speed and better fuel economy while shorter gearing provides more low end torque and better acceleration. Taller gearing is better for daily driving especially if you are planning on doing a lot of highway driving or are simply going to run small tires. Shorter gearing is needed for large tires and also aids in rock crawling by increasing low end torque.

How Does Gearing Work?

The gearing of your axles is set by the number of teeth on the ring and pinion gears. This determines how many times your driveshaft will have to rotate to spin the wheels once. A 4.10:1 gear ratio, for example, would mean that your driveshaft would have to spin 4.10 times to spin the wheels once.

The stock gear ratio tends to vary depending on the year and package your Jeep has. Some of the possible ratios include 3.07, 3.55, 3.73, and 4.10. Wranglers that are equipped with the Rubicon package typically come with the 4.10 gear set in their Dana 44 axles. The chart below shows the relationship between gear ratios and tire size. The numbers across the top are gear ratios, the numbers down the left side are tire sizes in inches, and the 4 digit numbers in the white boxes show RPM.

Why Should I Regear?

If you do a lot of highway driving on small to mid sized tires, it may be practical to regear to a taller setup to increase your top speed and fuel economy. If you are planning on doing a lot of off-roading or are only upgrading to a larger set of tires, you should probably install shorter gears.

When larger tires are installed, you have several things working against you: the diameter of the tire, rotational mass, rolling resistance, and the added weight of the tires. The diameter of your tires directly affects how hard your drivetrain has to work in order to move the vehicle, what you need to keep in mind is the axle is going to be turning your wheels. The axle shafts are just over an inch in diameter, and they have to turn whatever tires are on your Wrangler. This means that with a 30 inch tire you need to apply 30 times more force to the axle in order to turn the wheel. By regearing to a shorter gear, you will increase the amount of force that is being sent to the axle, this allows your Jeep to move the tires with less of a strain on the engine.

How Much it Costs to Regear Your Jeep

Replacing your Jeep's ring and pinion gears is more than simply purchasing a ring and pinion set. There are a number of bearings, seals, bolts, and the differential cover gaskets to worry about. If you're replacing the gears in both front and rear differentials, your overall cost will be understandably more. An entire gear overhaul kit will run you anywhere from $600-$1,200.

Certain differentials can only accommodate certain size ring gears. Generally, the higher numerically you go in gears, the bigger the ring gear. Should you need to upgrade the differential's carrier, this is the time to decide if you want to upgrade to lockers. No reason to do the work twice should you decide on lockers later. A new differential carrier will run about $700-$1,000.

Labor will always vary by region and shop, but you expect a ring and pinion gear installed to be approximately $500-$700 per axle. The being said, a complete regear job is several thousand dollars, done properly. 

How to Regear Your Jeep

Unless you're familiar with wrenching on your Wrangler (more than oil changes and filter swaps), we highly recommend bringing your Jeep to a professional to have ring and pinion gears installed. What follows is a simplified version of how to install gears in your Jeep. For a more detailed look, see our related installation guides.

  • Drain the differential's gear oil
  • Remove the axle shafts
  • If you're not replacing the main caps, mark them so you know which side they came from
  • Clean all new parts and remove any metal shaving within the carrier
  • Coat all new bearings and seals with fresh gear oil
  • Install the ring gear on the carrier, checking for proper shimming and backlash
  • Install the pinion gear and press on the carrier bearing, checking for proper bearing preloads
  • Reinstall the entire assembly into the differential housing

Jeep JK with the 3.6L Engine Gear Ratio & Tires Chart

Jeep JK Gear Ratio Chart for the 3.6L and the Automatic Trans. *Note* Red cells are the minimum allowable gear set. Expect sluggish performance, minimal overdrive use, and low elevation trails. Green cells are acceptable gear sets for daily driving, constant overdrive use, and slightly complex trails with moderate elevation changes. Yellow cells are performance oriented. Okay for daily driving, but more for rock crawling and extreme trails. The charts display RPMs at 70 mph.

Tire Size3.213.734.104.564.885.135.385.866.176.507.17
2921622512276130713286345536233946415543774828
3020902428266929683177333935023815401642314667
3120222350258328733074323233893692388740954517
3219592276250227832978313132833576376539674376
3319002207242626982888303631843468365138474243
3418442142235526192803294730903366354437334118
3517912081228825442723286230023270344336274001
3617412023222424742647278329183179334735263889
3716941969216424072576270828403093325734313784
3816501917210723432508263627653012317133403685
3916071868205322832444256926942934309032553590
4015671821200222262382250526272861301231733500
4115291777195321722324244325632791293930963415
4214931734190621202269238525022725286930223334
4314581694186220712216233024432661280229523256
4414251655182020242166227723882601273828853182


Jeep JK Gear Ratio Chart for the 3.6L and the Manual Trans

Tire Size3.213.734.104.564.885.135.385.866.176.507.17
2920762412265129493156331734793789399042034636
3020062332256328503050320733633663385740634482
3119422256248027582952310332543545373239324337
3218812186240326722860300631533434361638094202
3318242120233025912773291530573330350636944074
3417702057226125152691282929673232340335853954
3517201998219724432615274928823140330634833842
3616721943213623752542267228023052321433863735
3716271890207823112473260027272970312732943634
3815841841202322502408253226552892304532083538
3915431793197121932346246725872818296731253448
4015051749192221382288240525222747289330473361
4114681706187520862232234624612680282229733279
4214331665183120362179229024022616275529023201
4314001627178819892128223723462556269128353127
4413691590174719432080218622932497263027703056

Jeep JK with the 3.8L Engine Gear Ratio & Tire Chart

Jeep JK Gear Ratio Chart for the 3.8L with the Automatic Transmission

Tire Sizes3.213.734.104.564.885.135.385.866.176.507.17
2917972088229525532732287230123281345436394014
3017372018221924682641277629113171333935173880
3116811953214723882556268728173069323134043755
3216291892208023132476260327292973313032983638
3315791835201722432401252426472883303531983527
3415331781195821772330245025692798294631043424
3514891730190221152264238024952718286230153326
3614481682184920562201231324262643278229313233
3714081637179920012141225123612571270728523146
3813711594175219482085219222982504263627773063
3913361553170718982031213522402439256827062985
4013031514166418511981208221842378250426382910
4112711477162318061932203121302320244325742839
4212411442158517631886198320802265238525122771
4312121408154817221842193720312212232924542707
4411841376151316821801189319852162227723982645

Jeep JK Gear Ratio Chart for the 3.8L Manual Transmission

Tire Sizes3.213.734.104.564.885.135.385.866.176.507.17
2921882542279531083326349736673994420644314887
3021152458270130053215338035453861406542834724
3120472378261429083112327134313737393441454572
3219832304253328173014316933233620381140154429
3319232234245627312923307332233510369638934295
3418662169238426512837298231283407358737794169
3518132107231625752756289730383310348536714049
3617632048225125042680281729543218338835693937
3717151993219024362607274128743131329634733831
3816701940213323722538266927993048321033813730
3916271891207823112473260027272970312732943634
4015861843202622532412253526592896304932123543
4115481798197721982353247325942825297531343457
4215111755193021462297241425322758290430593375
4314761715188520962243235824732694283629883296
4414421676184220492192230524172633277229203221

TJ Wrangler Speedometer Gear Tooth Chart

Electric Driven Speedometer Gear Chart for 1993-2006 Wranglers - Short Shaft


44" tire42" tire40" tire38" tire36" tire25" tire34" tire33" tire32" tire31" tire30" tire29" tire28" tire27" tire
5.38 gears343638404243--------
5.13 gears3234363840414243------
4.88 gears303234363839404143-----
4.56 gears2830323436373839404243---
4.10 gears-26283032333435363738394041
3.73 gears---2628293031323334353637
3.55 gears----27282930313233343536
3.07 gears--------262728293031

Jeep Stock Gear Ratio Chart and Differential Chart

Non-RubiconFrontRearOption
YJDana 30 (27 Spline)Dana 35 (27 Spline)Dana 44 (30 Spline)
TJ
JKDana 44 (30 Spline)-
*Early 2007 JKs may have the Dana 35, mid-run change
RubiconFrontRearOption
TJDana 44 (30 Spline)Dana 44 (30 Spline)-
JK
Stock GearingYJTJJK
2.5L I4 Auto3.73-
2.5L I4 Manual4.10
4.0L/4.2L I6 Auto3.55
4.0L/4.2L I6 Manual3.07
3.6 LV6 Auto-3.21 (3.73/4.10)
3.6L V6 Manual-
Stock gearing in Rubicons is 4.10 regardless of trans/engine/gen
Fitment includes: JL, JK, TJ, YJ, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, Laredo, Sport, Islander, S, Sahara, Renegade, SE, X, Rubicon, Unlimited, Sport-S