Revolution Gear & Axle Jeep Wrangler JK/JL Dana 30 Reverse Front Axle 5.13 Ratio Ring & Pinion Set
A 5.13 front gear set is what a non-Rubicon Wrangler usually needs once it is on 37 inch tires, carries a heavy armor and gear load, or crawls technical trails with an automatic. The Revolution Gear and Axle D30JK-JL-513R is a new 5.13 ratio ring and pinion for the reverse-rotation Dana 30 front axle in the 2007-2018 Wrangler JK and the 2018-and-later JL. It replaces factory gearing that leaves a big-tire Jeep straining on hills, slipping out of overdrive and running hot at highway speed.
The 5.13 ratio is one of the deepest available for this axle; Revolution offers this design from 4.10 up to 5.38. It multiplies torque more than a 4.88 for the same engine speed, which makes up for the extra diameter and weight of a 37 inch tire. Because the pinion head gets smaller as the ratio climbs, the ring gear sits thicker on the carrier, so this set needs a carrier for the 3.73-and-up series. Revolution lists the carrier break at 3.55/3.73.
In the JK and JL, the front Dana 30 runs reverse rotation with the pinion mounted high. That geometry helps clearance and driveshaft angle, but the teeth are loaded on what is normally the coast side, so the set is cut specifically for it. Revolution specifies a 7.2 inch ring gear, 26-spline pinion, ten 3/8 inch ring gear bolts and 8620 steel.
Make sure the front axle is a Dana 30 and not a Rubicon Dana 44; our Dana 30 front axle problems and rebuild cost page shows how to identify it and what a regear costs. Use the regear after bigger tires guide to confirm 5.13 is right for your tire size, transmission and use; a lighter two-door on 35s may be better served by the 4.56 version of this set. Also keep in mind that Yukon rates the Dana 30 for tires up to 33 inches, so a 37 inch build that sees hard use should plan for stronger axle shafts and joints, and many owners eventually swap to a heavier front axle.
Revolution lists D30JK-JL-513R for the front Dana 30 reverse-rotation axle on 2007-2018 Jeep Wrangler JK and 2018-and-later Jeep Wrangler JL non-Rubicon models. It is not for the JK or JL Rubicon Dana 44, for standard-rotation TJ, YJ or XJ Dana 30 axles, or for any rear axle. If the Jeep has had an axle swap, read the housing tag, or send us year, trim and VIN to check. More gear sets and carriers are in our hard parts collection.
A 5.13 regear is a full setup job. Use a new bearing kit such as the Revolution JK Dana 30 front Koyo master install kit on a JK; Revolution publishes different setup specs for the JL M186 front, so a JL needs a kit made for that axle. For the JK Dana 30, Revolution lists 0.065 in. starting pinion depth, 12-15 in-lb pinion preload, .006-.010 in. backlash, 55 or 75 ft-lb on the ring gear bolts depending on bolt size, and 60 ft-lb caps. Set depth first, then preload and backlash, and read the pattern with marking compound on both faces of the teeth. The rear must be the same 5.13 ratio; on a JK the Revolution JK Dana 44 rear 5.13 set is the match, or buy both axles together with the JK non-Rubicon 5.13 gear package. Follow the new ring and pinion break-in procedure and change the gear oil at about 500 miles, then reprogram the speedometer for the new ratio and tire size.
| Brand | Revolution Gear & Axle |
| Part number | D30JK-JL-513R |
| Fits | Revolution Gear & Axle Jeep Wrangler JK/JL Dana 30 Reverse Front 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.
5.13 is usually chosen for about 37 inch tires or heavy builds. On 35 inch tires most JKs and JLs run 4.56 or 4.88. Check your tire size, transmission and how much highway driving you do before choosing.
No. JK and JL Rubicons use a Dana 44 front. This set is for the non-Rubicon Dana 30 reverse-rotation front axle only.
Only if it is a 3.73-and-up carrier. Revolution lists the carrier break at 3.55/3.73, so a Jeep that came with lower gears needs a new carrier or a locker for the deep-gear series.
The gears will restore performance, but the axle itself is light for 37s. Yukon rates the Dana 30 for tires up to 33 inches, so stronger shafts, joints and careful driving are needed on a hard-used 37 inch build.
Match the rear axle to 5.13, break the gears in gently and change the gear oil at about 500 miles, and recalibrate the speedometer for the new ratio and tire size.
