Revolution Gear & Axle Jeep Wrangler JK Dana 44 Rear Axle 5.13 Ratio Ring & Pinion Set
Once a Wrangler JK goes to 37 inch tires, the factory 3.21, 3.73 or even the Rubicon's 4.10 gears are simply too tall. The Jeep struggles to hold top gear at highway speed, the automatic hunts on every overpass, and on the trail you are riding the brakes down ledges you used to crawl. The Revolution Gear & Axle D44JK-513 is a new 5.13 ring and pinion for the rear Dana 44 in the 2007-2018 JK and JK Unlimited, the ratio most builders pick for 37s and heavy, loaded-down rigs.
The rear driveshaft spins the pinion, the pinion drives the ring gear, and the ring gear turns the carrier and both axle shafts. At 5.13 the driveshaft makes just over five turns for every turn of the tire, compared with 3.21 to 4.10 from the factory. That extra reduction cancels the tall overall gearing a 37 inch tire creates, so the engine sits back in its useful rpm range at cruise and has leverage at a crawl. Revolution builds this gear line in 8620 steel with standard rotation, a 24-spline pinion, an 8.5 inch ring gear and ten ring gear bolt holes drilled for both 7/16 inch and 1/2 inch bolts. At 5.13 the pinion head is small, so this is a ratio for big tires, not a casual swap on 33s.
Start with the carrier, because that decides the real cost of a 5.13 swap. Dana 44 carriers split between ratios; Revolution's specification block for the 3.73 option of this gear line lists the 3.73-and-down carrier, while the genuine Spicer 5.13 set Revolution sells for the same JK rear lists a 3.92-and-up carrier. A Rubicon that left the factory with 4.10 gears already has a 3.92-and-up locker carrier. A non-Rubicon with 3.21 or 3.73 gears will need a 3.92-and-up carrier, such as the Eaton Truetrac for 3.92-and-up once you confirm it is listed for your 30-spline JK rear. Read the rear axle tag to confirm a Dana 44 and the current ratio; Revolution notes fewer than a thousand early 2007 JKs got a Dana 35 rear instead. Run your measured tire height through our regear after bigger tires guide to check 5.13 against 4.88 for your transmission.
The listing and Revolution's product page fit this set to the rear Dana 44 in every 2007-2018 Jeep Wrangler JK, two-door and Unlimited, Rubicon and non-Rubicon. It does not fit the JK front axle, the 2018-up JL or the JT Gladiator, which use different Dana 44 gears. The front axle has to be regeared to 5.13 at the same time or the transfer case will bind in 4WD. On a Rubicon that is a reverse-cut front Dana 44 set; on a Sport or Sahara it is a Dana 30 set, and Revolution notes that the Dana 30 JK front only needs a new carrier when coming from the factory 3.21 ratio. If you want both ends and bearings in one box, the JK non-Rubicon 5.13 Timken gear package covers it. Staying on 35s? The JK rear 4.56 set is the better match. Send us your year, trim and VIN if you are not sure what is under your Jeep, and see our JK regear kit buyer's guide for the full parts list.
These are gears only. Pair them with a rear master install kit, the JK Rubicon rear master kit or the JK non-Rubicon rear master kit. Revolution's setup chart for the D44JK starts pinion depth at 0.042 in, with 22-35 in-lb pinion bearing preload, 0.006-0.010 in backlash, ring gear bolts at 75 ft-lb (7/16 inch) or 135 ft-lb (1/2 inch) and bearing caps at 80 ft-lb. Because a 5.13 swap usually means a new carrier, use the ring gear bolt size that carrier is threaded for. On a Rubicon, disconnect the rear locker wiring before pulling the carrier. Read drive and coast patterns with marking compound, fill with 75W-90 or 75W-140 gear oil (add friction modifier for a clutch-type limited slip), keep the first few hundred miles gentle with no towing, change the oil, and reprogram the tire size and ratio so the speedometer and shift points are right.
| Brand | Revolution Gear & Axle |
| Part number | D44JK-513 |
| Fits | Revolution Gear & Axle Jeep Wrangler JK Dana 44 Rear Axle 5.13 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.
Yes. The listing and Revolution fit it to the rear Dana 44 in all 2007-2018 Wrangler JK models. The carrier you pair it with is what differs, so check which carrier your axle has before ordering.
Usually yes on a non-Rubicon. A 5.13 needs a 3.92-and-up Dana 44 carrier, and JKs that came with 3.21 or 3.73 gears have the smaller-ratio carrier. Rubicons built with 4.10 gears already have a 3.92-and-up carrier.
It is the common choice for 37 inch tires, or 35s on a heavily loaded JK that tows. On standard 35s most owners are happier with 4.56 or 4.88. Check your numbers in our regear after bigger tires guide.
Yes. Both axles must have the same ratio on a 4x4, or the transfer case binds in four-wheel drive. Rubicons need a reverse-cut front Dana 44 set and other JK trims need a Dana 30 front set in 5.13.
A rear master install kit with pinion and carrier bearings, races, shims, crush sleeve and pinion seal, plus a 3.92-and-up carrier if your JK came with low factory gears. Fresh gear oil is needed for break-in.
Revolution's chart lists 0.042 in starting pinion depth, 22-35 in-lb pinion bearing preload, 0.006-0.010 in backlash, ring gear bolts at 75 or 135 ft-lb by bolt size, and 80 ft-lb on the bearing caps. Confirm with a contact pattern.
