Revolution Gear & Axle Jeep Wrangler JK Dana 44 Rear Axle 3.73 Ratio Ring & Pinion Set
Not every Wrangler JK regear is about giant tires. A 3.73 suits a JK that went to 32 or 33 inch tires and spends most of its life on pavement, or one whose rear gears are simply worn and noisy and the owner wants to stay close to the gearing the Jeep already has. The Revolution Gear & Axle D44JK-373 is a new 3.73 ring and pinion for the rear Dana 44 under the 2007-2018 Jeep Wrangler JK and Wrangler Unlimited.
The rear driveshaft turns the pinion, the pinion turns the ring gear, and the ring gear spins the carrier and both 30-spline axle shafts. A 3.73 ratio means 3.73 driveshaft turns per turn of the rear tires. It is the mildest ratio in Revolution's JK rear line, which runs from 3.73 to 5.38, so it keeps highway rpm low while still taking back some of what a modest tire upgrade costs. Revolution's spec block for this set lists standard rotation, a 24-spline pinion, an 8.5 inch ring gear, ten ring gear bolt holes drilled for both 7/16 inch and 1/2 inch bolts, 8620 steel, and a 3.73-and-down carrier break.
Check the axle tag on the rear cover to confirm a Dana 44 and read the current ratio. Revolution notes that a small number of early 2007 JKs, fewer than a thousand, were built with a Dana 35 rear instead, and those need different gears. Next, look at the carrier. Dana 44 carriers are split by ratio, and Revolution lists this 3.73 on the 3.73-and-down carrier. Rubicons left the factory with 4.10 gears, so their locker carrier is the 3.92-and-up series and will not take a 3.73 ring gear without a carrier change. Our JK regear kit buyer's guide walks through ratio choice by tire size, and the Dana 44 problems and rebuild cost guide helps if the real complaint is noise.
The listing and Revolution's product page fit this set to the rear Dana 44 on all 2007-2018 Jeep Wrangler JK models, two-door and Unlimited. It does not fit the JK front axle, which is a Dana 30 on most trims and a reverse-rotation Dana 44 on the Rubicon, and it does not fit the 2018-up JL or Gladiator. The carrier must be the 3.73-and-down series; if yours is not, budget for a carrier such as the Detroit Truetrac for 3.73-and-down after confirming it is listed for the JK rear. If you plan to go to 35s later, the JK rear 4.56 set is the better buy now. When in doubt, send us your year, trim and VIN.
Set the gears up with fresh bearings. We carry the Revolution non-Rubicon JK rear master install kit and the Rubicon JK rear master install kit; buy the one that matches your trim. Revolution's setup chart lists these D44JK figures: 0.042 in starting pinion depth, 22-35 in-lb pinion bearing preload, 0.006-0.010 in backlash, 75 ft-lb on 7/16 inch ring gear bolts or 135 ft-lb on 1/2 inch bolts, and 80 ft-lb on the bearing caps. Pull both axle shafts and mark the bearing caps before removing the carrier, and use the original pinion shim stack as the starting point. Confirm the contact pattern before closing it up, fill with 75W-90 or 75W-140 gear oil (add friction modifier for a clutch-type limited slip), and keep the first few hundred miles gentle before an early oil change. A 4x4 JK needs a matching 3.73 in the front axle, and the computer must be updated for the new ratio and tire size.
| Brand | Revolution Gear & Axle |
| Part number | D44JK-373 |
| Fits | Revolution Gear & Axle Jeep Wrangler JK Dana 44 Rear Axle 3.73 Ratio Ring & Pinion Set |
| Type | Ring & Pinions |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The gears fit the Rubicon rear Dana 44, but Rubicons came with 4.10 gears on a 3.92-and-up locker carrier. Revolution lists this 3.73 on the 3.73-and-down carrier, so a Rubicon needs a different carrier to run it.
No. It is a rear Dana 44 set. Sport and Sahara JKs use a Dana 30 front and Rubicons use a reverse-rotation Dana 44 front, and each needs its own 3.73 set to match.
For most JKs on 35s, no. A 3.73 suits stock-size to 33 inch tires or a mostly highway Jeep. Owners running 35s usually pick 4.56, and 37s usually go to 4.88 or 5.13.
New pinion and carrier bearings and races, pinion shims, a pinion seal, a crush sleeve and ring gear bolts. A JK rear master install kit for your trim includes these.
Use 75W-90 or 75W-140 gear oil, with friction modifier if the carrier is a clutch-type limited slip. Change it after the first few hundred miles of break-in.
Yes. Update the axle ratio and tire size in the computer so the speedometer, transmission shift points and stability systems work correctly.
