Overview
The G2 Axle and Gear 4-JK-488 is a 4.88 ratio front and rear ring and pinion kit for non-Rubicon Jeep Wrangler JK models. The JK code in the title places it in the 2007-2018 Wrangler range. The gear sets are made for a Dana 30 front and a Dana 44 rear, so the kit replaces the gears at both ends of the vehicle.
The kit comes with front and rear master installation kits, which are matched to the front and rear gear sets. The gears are manufactured to original equipment specifications and are double shot peened and double lapped for a more durable finish.
Key features
- Front and rear 4.88 ratio ring and pinion sets
- Dana 30 front and Dana 44 rear gear sets
- Matched front and rear master installation kits
- Computer heat treated 8620 steel
- Double shot peened and double lapped
- Built to original equipment specifications
Matching carriers and gears
The carrier is the housing that holds the differential gears, and a gear set must match the carrier it is fitted into. Before ordering, check the carrier type and the axle housing on the vehicle. A front Dana 30 and rear Dana 44 setup each have their own carrier pattern, so the front and rear should be measured separately.
On a Wrangler that sees off-road use, the axles take hard loads. New gears need careful break-in, and the pinion depth and backlash should be checked once the set is installed. Installers commonly replace the carrier bearings and seals while the housing is open, which keeps the rebuilt axle sealed and quiet.
- Measure each carrier before fitting the gears
- Keep front and rear master installation kits separate
- Replace worn carrier bearings and pinion seals with the set
- Check for noise and leaks after the first drives
Specifications
| Brand | G2 Axle and Gear |
|---|---|
| Part number | 4-JK-488 |
| UPC | 700007521531 |
| Gear ratio | 4.88 |
| Front axle | Dana 30 JK |
| Rear axle | Dana 44 JK |
| Material | Computer heat treated 8620 steel |
| Models | Non-Rubicon |
| Warranty | Limited lifetime |
Vehicle fitment
The JK chassis code in the name places it in the 2007-2018 Wrangler range. The gear sets are made for a Dana 30 front and Dana 44 rear.
The 2007-2018 range covers the JK generation, so TJ, LJ, YJ and JL Wranglers fall outside it. The kit is made for non-Rubicon models only. Make sure your year, model and trim match before ordering.
Installation notes
Set the pinion depth and backlash for the front and rear gear sets after installation, and do not mix the front and rear master installation kits between axles. Measure the carrier before fitting the front Dana 30 gears, since the carrier has to match the gear set.
What’s included
Front and rear 4.88 ring and pinion sets, plus matched front and rear master installation kits.
Not included: The carriers are sold separately.
