Jeep Regear Guide: Gear Ratios, Cost and How-To

Reprogram it

Your Jeep still thinks it has factory tires and gears. Set your tire size and gear ratio so the speedometer reads true and the transmission shifts where it should.

Tazer JL Mini (gas and diesel JL, JT)Tazer JK Blaster (JK)

Add lockers

The carrier is already out, so a locker adds an hour or two of setup, not a second teardown.

JL & JT LockersJK Lockers

Upgrade the shafts

Discovery Series 4340 chromoly axle kits for the JL, JT and JK, with a 10 Year Limited Warranty on the shafts. 2024 and newer Wrangler Rubicons have a full-float rear (the hubs carry the weight, not the axle shafts), so call us to match rear shafts.

JL & JT Axle KitsJK Axle Kits

Cover it

A heavy-duty differential cover protects the new gears you just paid for.

JL & JT Diff CoversJK Diff Covers

DIY makes sense if you have

✓A dial indicator with a magnetic base

✓A beam or dial inch-pound torque wrench for bearing preload (a click-type can't read rotating torque), plus a foot-pound torque wrench

✓A big breaker bar or impact and a pinion yoke or flange holder for the crush sleeve

✓A bearing puller, a press and a bearing driver set

✓Pry bars and a dead-blow hammer for the carrier, or a case spreader

✓Gear marking compound for the contact pattern

✓Patience to set up, check and reshim more than once

Go to a gear shop if

✓It's your first regear

✓You need the Jeep back on the road this week

✓You don't have those tools

✓You want a shop to stand behind the setup

Wrangler JL & Gladiator JT

2018+ JL and 2020+ Gladiator gear packages by axle combo, 4.56 to 5.38 (5.13 max with a Dana 35 rear).

Shop JL & JT

Wrangler JK

2007-2018 JK gear packages for Rubicon and non-Rubicon, 4.10 to 5.38.

Shop JK

Do I need to regear for bigger tires?

Usually, once you're about 2 inches or more over your factory tire size. Taller tires make factory gears act taller, so the engine works harder, the automatic hunts between gears, and a JL or Gladiator 8-speed may stop using 8th. A lift by itself doesn't change your gearing, but bigger tires do. Regearing to a numerically higher ratio, like 4.56 or 4.88 for 35s on a 3.6L, gives back the gearing the bigger tires took away.

Can I run 35s without regearing?

You can, but the engine works harder. On true 35s, a JL Rubicon's factory 4.10s drive like 3.83s and cruise at about 1,850 RPM at 70 mph in 8th, and a Sport or Sahara with 3.45s drops to about 1,550. That's why the 8-speed hunts and may stop holding 8th. Regearing to 4.56 or 4.88 puts cruise at about 2,050 to 2,200 RPM.

What gear ratio do I need for 33-inch tires?

Gas JL and Gladiator Rubicons already ride on 33-inch tires with 4.10s from the factory, so most don't regear for 33s. For a JL with factory 3.45s or 3.73s, or a Gladiator with 3.73s, call us for a pick. A 2012-2018 JK with the 3.6L runs 4.10 on 33s, and a 2007-2011 JK with the 3.8L runs 4.56. A TJ with the 4.0L runs 4.10 to 4.56, or 4.10 with the 32RH automatic.

What gear ratio do I need for 35-inch tires?

On 35-inch tires, a Wrangler JL or Gladiator with the 3.6L automatic runs 4.56 to 4.88, and the 6-speed manual runs 4.88. The JL 2.0L turbo, the 3.0L EcoDiesel and the JL 392 all run 4.56, and 2024 and newer 392s already ship with it. On a JK, the 2012-2018 3.6L runs 4.56 to 4.88 and the 2007-2011 3.8L runs 4.88 to 5.13. A TJ with the 4.0L runs 4.56 to 4.88, or 4.56 with the 32RH automatic.

What gear ratio do I need for 37-inch tires?

On 37-inch tires, a Wrangler JL or Gladiator with the 3.6L automatic runs 4.88 to 5.13, and the 6-speed manual runs 5.13. The JL 2.0L turbo runs 4.88, the 3.0L EcoDiesel 4.56 and the JL 392 4.56 to 4.88. On a JK, the 2012-2018 3.6L runs 4.88 to 5.13 and the 2007-2011 3.8L runs 5.13 to 5.38. A TJ with the 4.0L runs 4.88 to 5.13, or 4.88 with the 32RH automatic. Heavy builds with armor, a rack, a loaded bed or a trailer take the higher number.

What gear ratio do I need for 40-inch tires?

On 40-inch tires, a Wrangler JL or Gladiator with the 3.6L automatic runs 5.13 to 5.38, and the 6-speed manual runs 5.38. The JL 2.0L turbo runs 5.13, the 3.0L EcoDiesel 4.56 to 4.88 and the JL 392 4.88 to 5.13. Every JK runs 5.38. For a TJ, call us. Our JL Dana 35 (M200) gears top out at 5.13, so on a JL we recommend a Dana 44 rear. New gears don't make a Dana 30 front or a Dana 35 rear any stronger, and deeper ratios use a smaller pinion. Plan on chromoly shafts at a minimum and talk to a tech about an axle upgrade. For 38s, 39s or 42s, call us for a pick.

Should I run 4.56 or 4.88 on 35s?

On a 3.6L automatic, 4.56 suits a lightly built Jeep that spends most of its time on pavement. Go with 4.88 if you run armor, a rack, a rooftop tent, a loaded Gladiator bed or a trailer, or if 37s are in your plans. The 6-speed manual takes 4.88. Shops call 4.88 a lower (or deeper) gear than 4.56, even though the number is bigger.

What does a 4.88 gear ratio mean?

It means the driveshaft turns 4.88 times for every full turn of the tires. A numerically higher ratio, like 4.88 over 4.56, multiplies more torque at the wheels and spins the engine faster at the same speed, which is what bigger tires need.

Can I regear just the rear axle?

No. The front and rear ratios have to match, or the driveline binds in four-wheel drive. A regear always means both axles, which is why our gear packages include both.

How much does it cost to regear a Jeep?

About $1,700 to $3,300 for front and rear, parts and labor, as of October 2026. A Revolution gear package runs about $700 to $1,300 depending on your Jeep, and shop labor usually runs $500 to $1,000 per axle. A new carrier, lockers, axle shafts and a programmer each add to that.

How long does a regear take?

Plan on a full day at most gear shops, about 6 to 10 hours of labor for front and rear. A carrier or locker adds an hour or two.

Do I need a new carrier?

Only if your factory carrier can't take the new ratio. The carrier is the part the ring gear bolts to, and each carrier only fits a range of ratios. The point where one carrier stops fitting and the next one starts is called the carrier break. In the Dana 30 front, a JL Sport or Sahara with factory 3.45s, a JK with factory 3.21s and a TJ with factory 3.07s or 3.55s all need a 3.73-and-up carrier. In a Dana 35 rear, a JL with factory 3.45s or a TJ coming from 3.07 needs a 3.54-and-up carrier. JL and Gladiator Dana 44s keep their factory carriers, and TJ Dana 44s keep theirs with thick gears. Send us your axle and factory ratio and we'll confirm.

How do I find my current gear ratio?

Look for the ratio on the tag or stamping on your axle. Your window sticker or a VIN build sheet lists it too. Or pull the cover, count the ring gear and pinion teeth and run them through our gear ratio calculator.

Will regearing improve my gas mileage?

Regearing usually wins back some of the fuel economy bigger tires cost you, because the engine stops lugging and the transmission can stay in top gear. Don't expect factory numbers, though. Heavier, taller tires cost mileage no matter what gears you run. More on that in our Tacoma write-up on regearing and gas mileage.

Does regearing change my crawl ratio?

Yes. Crawl ratio is first gear x transfer case low range x axle ratio, so it rises by the same percentage as your axle ratio. A JL Rubicon automatic is 4.71 x 4.0 x 4.10, or 77.2:1, the figure Jeep publishes. With 4.88s it's about 91.9:1.

Do I need to reprogram after a regear?

Yes. Until you update the tire size and gear ratio, your Jeep runs on its factory numbers, so the speedometer reads wrong on bigger tires and the transmission shifts on the wrong schedule. A Tazer JL Mini sets both on a gas or diesel JL and on a Gladiator, and a Tazer JK Blaster does it on a JK. On a 4xe, call us first. On most 1997-2004 TJs, you swap the speedometer gear in the transfer case tail housing, and 2005-2006 models may need a dealer scan-tool recalibration.

How far off is my speedometer on bigger tires?

It reads slow by the same percentage your tires grew. Going from a JL Rubicon's 32.7-inch factory tires to true 35s, 65 mph on the dash is about 70 mph, and on 37s it's about 74. The odometer under-counts by the same amount until you reprogram.

What comes in a gear package?

Both ring and pinion sets in the ratio you pick, front and rear, plus a master install kit for each axle with the parts needed to overhaul that ring and pinion setup.

What's the warranty on a gear package?

Revolution ring and pinions carry a Two Year Limited Warranty (9310 Pro Gears have their own terms). Master install kits carry a one-year warranty against manufacturing defects. Full details are on our warranty page.