Overview
The G2 Axle and Gear 4-JKRUB-488 is a 4.88 ratio front and rear ring and pinion kit for the Rubicon Jeep Wrangler JK, with Dana 44 axles at both ends. The JK chassis code in the title covers the 2007-2018 Wrangler, and the Rubicon designation tells you which axle set G2 describes.
One kit carries the front and rear gears, so the gear ratio can be matched across both axles in a single job. The matched master installation kits come with the set, and the gears are made from computer heat treated 8620 steel with double shot peening.
Key features
- Front and rear 4.88 ratio gear sets for Dana 44 axles
- Matched master installation kits for each axle
- Computer heat treated 8620 steel construction
- Double shot peened and double lapped gears
- Manufactured to original equipment specifications
Keeping the gears quiet
Quiet gears depend on careful setup. Backlash and pinion depth both affect how the teeth mesh, and a contact pattern that sits off center is a common source of whine. Take the time to check the pattern with marking compound before the carrier is closed up, and adjust until the pattern is centered on the tooth face.
Noise can also come from the wider driveline. Worn U-joints, loose pinion yoke nuts and a worn transfer case can all sound like gear noise on the road. Ruling these out before blaming the gears saves a second teardown, and a quick check of the drive angles helps keep the setup smooth.
- Contact pattern checked with marking compound
- Backlash set on both axles
- U-joints and pinion yoke nuts checked
Specifications
| Brand | G2 Axle and Gear |
|---|---|
| Part number | 4-JKRUB-488 |
| UPC | 700007521561 |
| Gear ratio | 4.88 |
| Front axle | Dana 44 JK |
| Rear axle | Dana 44 JK |
| Material | Computer heat treated 8620 steel |
| Models | Rubicon |
| Warranty | Limited lifetime |
Vehicle fitment
The JK chassis code in the name covers the 2007-2018 Wrangler. The kit is made for Rubicon models with Dana 44 axles at both ends.
The years cover the JK generation only, so the TJ, LJ and JL Wranglers are not covered. A non-Rubicon JK may use a different front axle, so confirm the axle setup before ordering. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
Set pinion depth and backlash on both axles once the gears are installed, using the matched master installation kits supplied with the set. Keep the front and rear kits separate so each gear set goes into its own carrier.
What’s included
Front and rear 4.88 ring and pinion sets with matched master installation kits for both axles.
