Revolution Gear & Axle Jeep Wrangler JK Dana 44 Rear Axle 4.56 Ratio Ring & Pinion Set
Thirty-five inch tires are the most popular upgrade on the Jeep Wrangler JK, and 4.56 is the gear ratio that usually goes with them. Without it, a JK on 35s lugs off the line, never settles into top gear on the interstate and drags its transmission through every hill. The Revolution Gear & Axle D44JK-456 is a new 4.56 ring and pinion for the rear Dana 44 under the 2007-2018 Wrangler JK and JK Unlimited, built for exactly that tire swap.
A 35 inch tire covers more ground per turn than the factory tire, which makes the overall gearing taller and robs the engine of leverage. The 4.56 ring and pinion multiplies driveshaft torque 4.56 times at the rear axle, enough to bring engine speed at a given road speed back near where it was on stock tires. The pinion head in a 4.56 is smaller than in a 3.73 or 4.10, which is why carriers change at this point, but 4.56 still leaves a good amount of tooth for strength compared with 4.88 and 5.13. Revolution builds this set in 8620 steel with standard rotation, a 24-spline pinion, an 8.5 inch ring gear and ten bolt holes drilled for both 7/16 inch and 1/2 inch ring gear bolts.
Read the tag on the rear cover to confirm a Dana 44 and note the current ratio; Revolution notes that fewer than a thousand early 2007 JKs got a Dana 35 rear, which needs different gears. Then check the carrier, because this is where 4.56 buyers get caught. Dana 44 carriers are split at 3.73 and 3.92, and Revolution lists the 3.73-and-down carrier for the 3.73 version of this set. A 4.56 ring gear needs the 3.92-and-up carrier. A Rubicon that came with 4.10 gears already has a 3.92-and-up locker carrier, while a JK with lower factory gears will need a new carrier such as the Dura Grip limited slip for 3.92-and-up, once you confirm it is listed for the JK rear. Our JK regear kit buyer's guide covers ratio choice, and the regear after bigger tires guide shows the math for your exact tire.
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, Rubicon and non-Rubicon. It does not fit the JK front axle, the 2018-up JL, or the Gladiator. On a 4x4, the front axle must also go to 4.56: Rubicons take a reverse-cut front Dana 44 set such as the JK Rubicon front 4.56 set, while other trims take a Dana 30 front set. Running 37s instead? Look at the JK rear 5.13 set. Send us your year, trim and VIN if you are unsure what is under your Jeep.
Pair the gears with the master install kit for your trim, either the Rubicon JK rear kit or the non-Rubicon version. Start from Revolution's D44JK numbers: 0.042 in starting pinion depth, 22-35 in-lb pinion bearing preload, 0.006-0.010 in backlash, ring gear bolts at 75 ft-lb for 7/16 inch hardware or 135 ft-lb for 1/2 inch, and bearing caps at 80 ft-lb. When moving to a new carrier, use ring gear bolts that match the carrier's threads. On a Rubicon, unplug and protect the e-locker wiring before pulling the carrier. Check the drive and coast patterns with marking compound, fill with 75W-90 or 75W-140 gear oil (friction modifier for clutch-type limited slips), keep the first few hundred miles easy with no towing, change the oil, and reprogram the ratio and tire size.
| Brand | Revolution Gear & Axle |
| Part number | D44JK-456 |
| Fits | Revolution Gear & Axle Jeep Wrangler JK Dana 44 Rear Axle 4.56 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.
Only if it is the 3.92-and-up series. Dana 44 carriers change between 3.73 and 3.92. Rubicons that came with 4.10 gears already have the right carrier; JKs with lower factory gears usually need a new carrier.
It is the most common choice for a JK on 35s, especially with the 3.6L engine. Owners running 37s or heavy builds usually go to 4.88 or 5.13.
Yes, on any 4x4 JK. Front and rear ratios must match or the drivetrain binds in four-wheel drive. Rubicons need a reverse-cut Dana 44 front set; other trims need a Dana 30 front set.
Yes. Revolution lists it for the rear Dana 44 on all 2007-2018 JK models. Use the master install kit that matches your trim, since the bearing kits differ.
75W-90 or 75W-140 gear oil, with friction modifier for a clutch-type limited slip. Change it after break-in.
The speedometer will read wrong and the transmission and stability systems will work from bad data. Update both after the install.
