Overview
The G2 Axle and Gear 4-JKRUB-488M is a complete 4.88 ring and pinion kit with minor installation kits for the Dana 44 front and rear axles of Rubicon Jeep Wrangler JK models from 2007 on.
Rubicon owners moving to larger tires often choose a 4.88 ratio for a balance of pulling power and highway rpm. The kit pairs front and rear Dana 44 gear sets with matched minor installation kits. The steel is computer heat treated 8620, built to O.E. specs and double lapped.
Selecting between ratios comes down to tire size and driving habits, and G2 sells this same Dana 44 kit in more than one ratio. The 4.88 ratio in this kit sits between the 4.56 and 5.13 options. Because the kit pairs front and rear sets, the ratios are matched, which matters because a mismatch can damage a four-wheel-drive system. The minor installation kits supply the small parts for each axle.
Key features
- Front and rear 4.88 gear sets
- Dana 44 front and Dana 44 rear
- Rubicon models, 2 and 4 door
- Matched minor installation kits
- Double shot peened
- Limited lifetime warranty per G2
Choosing between ratios
Picking a ratio is a balance between low-speed pulling power and comfortable highway rpm. A middle ratio like this one suits many Rubicon owners who run a moderate tire upgrade, since it keeps the engine from working too hard on the highway while still helping on climbs. The right choice depends on how much time the vehicle spends off-road.
Gear changes work best when the rest of the drivetrain is sound. Check U-joints, the transfer case and axle seals before the swap, since worn parts can fail sooner under new gearing. After the swap, drive gently through the break-in period and watch for noise, heat or leaks.
- Match the ratio to your tire size
- Inspect U-joints and axle seals before the swap
- Keep the same ratio in front and rear
Specifications
| Brand | G2 Axle and Gear |
|---|---|
| Part number | 4-JKRUB-488M |
| UPC | 631410141146 |
| Part type | Ring and pinion gear kit with minor installation kits |
| Gear ratio | 4.88 |
| Axles | Dana 44 front, Dana 44 rear |
| Models | Rubicon, 2 and 4 door |
| Steel | Computer heat treated 8620 |
| Finishing | Double shot peened, double lapped |
| Warranty | Limited lifetime |
Vehicle fitment
It fits the 2007–2018 Jeep Wrangler JK Rubicon, in 2-door and 4-door form.
JKs with a Dana 30 front and the older TJ are not covered. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
Ring and pinion work needs correct shimming and a break-in drive. Have the axle set up by someone who does gear installs regularly.
What’s included
- Front 4.88 ring and pinion set
- Rear 4.88 ring and pinion set
- Front and rear matched minor installation kits
Not included: Bearings and other parts beyond the minor kits are not included.
