Yukon Jeep JK Dana 30 Ring & Pinion - Rev. Rotation, 24 Spline Short Pinion
YG D30SR-373JK
The Yukon Dana 30 Jeep JK Ring & Pinion Gear Set is designed for Jeep Wrangler JK front axles using the Dana 30 reverse rotation, short-pinion configuration. Regearing is one of the most effective ways to restore lost pulling power after installing larger tires, improve low-speed control, and get the engine back into a more useful operating range. Available in 3.73, 4.11, 4.56, 4.88, and 5.13 ratios, these gears give JK owners options for daily driving, trail riding, and off-road builds.
The factory Dana 30 front axle uses a reverse rotation gear design that must be matched correctly when replacing the ring and pinion. Numerically lower ratios favor highway driving, while deeper gears increase torque multiplication to help offset larger tires and improve low-speed performance. Whether you're replacing worn gears or changing ratios, proper pinion depth, bearing preload, backlash, and gear contact pattern are critical for quiet operation and long-term reliability.
Includes:
- (1) Yukon Dana 30 Ring Gear
- (1) Matching Reverse Rotation Short Pinion Gear
Available Gear Ratios: 3.73, 4.11, 4.56, 4.88, 5.13
Note: Bearings, seals, shims, differential carrier components, and master installation kits are sold separately unless otherwise specified.
Specifications
| Manufacturer | Yukon Gear & Axle |
|---|---|
| Product Type | Ring & Pinion Gear Set |
| Axle Platform | Dana Spicer 30 |
| Vehicle Platform | Jeep Wrangler JK |
| Axle Position | Front |
| Gear Rotation | Reverse Rotation / High Pinion |
| Pinion Style | Short Pinion |
| Pinion Spline Count | 24-Spline |
| Available Gear Ratios | 3.73 / 4.11 / 4.56 / 4.88 / 5.13 |
| Differential Cover Bolt Count | 10 |
| Gear Configuration | Matched Ring & Pinion Set |
| Installation Type | Internal Differential Gear Replacement |
| Primary Application | Jeep JK Front Axle Regearing |
| Quantity | One Matched Gear Set |
Fitment
Designed for Jeep Wrangler JK models equipped with the factory Dana 30 reverse rotation front axle and 24-spline short pinion configuration. Verify your axle and carrier compatibility before ordering.
| Make | Model | Year Range | Axle Application |
|---|---|---|---|
| Jeep | Wrangler JK Non-Rubicon | 2007–2018 | Dana 30 Reverse Rotation Front |
| Jeep | Wrangler Unlimited JK Non-Rubicon | 2007–2018 | Dana 30 Reverse Rotation Front |
Fitment Notes:
- Fits compatible Jeep JK Dana 30 reverse rotation front differentials
- Requires 24-spline short pinion configuration
- Front axle applications only
- Not compatible with factory Dana 44 Rubicon front axles
- Not interchangeable with standard rotation Dana 30 ring and pinion gear sets
- Verify axle identification, carrier break, and selected gear ratio before ordering
- Front and rear axle ratios must match on 4WD vehicles
FAQ
What gear ratio should I choose for my Jeep JK?
The best ratio depends on tire size, engine, transmission, vehicle weight, and how you use your Jeep. Numerically lower ratios are generally better suited to highway driving, while deeper gears help restore pulling power after larger tire upgrades and improve low-speed off-road performance.
| Gear Ratio | Common Applications |
|---|---|
| 3.73 | Stock tire sizes and highway-focused driving |
| 4.11 | Daily driving and mild tire upgrades |
| 4.56 | Moderate tire upgrades and mixed trail use |
| 4.88 | Larger tires and more aggressive off-road driving |
| 5.13 | Large tires and builds prioritizing low-speed torque multiplication |
Builder Note: These are general starting points, not fixed tire-size recommendations. Gear selection should account for the complete drivetrain and intended use.
What is a reverse rotation Dana 30 ring and pinion?
The Jeep JK Dana 30 front axle uses a reverse rotation, high-pinion gear design. The ring and pinion tooth geometry differs from a standard rotation Dana 30, so the correct reverse rotation gear set must be used for this axle.
Will these gears fit a Jeep JK Rubicon?
No. Factory Jeep JK Rubicon models use a Dana 44 front axle, which requires a different ring and pinion gear set. This listing is for compatible Dana 30 front axle applications.
Does this gear set include a master installation kit?
No. This listing includes the matching ring and pinion gears only. We recommend a compatible Dana 30 JK master overhaul kit with bearings, races, seals, shims, and setup hardware when installing new gears.
Will these gears work with my existing differential carrier?
That depends on the selected ratio and your existing carrier configuration. Dana 30 axles use carrier breaks that affect ring gear mounting position. Verify your carrier compatibility before ordering, especially when changing from a factory ratio to deeper gears.
Do I need to change the rear axle gears too?
Yes. Front and rear axle gear ratios must match on a four-wheel-drive Jeep. If you're changing the front Dana 30 ratio, the rear differential must use the same ratio before operating in four-wheel drive.
What is required for proper ring and pinion installation?
Correct pinion depth, pinion bearing preload, carrier bearing preload, ring gear backlash, and tooth contact pattern are essential. We recommend using a compatible master overhaul kit and following the proper axle setup procedures to prevent gear noise and premature wear.
