Overview
The G2 Axle and Gear 4.88 ring and pinion, part G/21-2151-488R, replaces the front gears in a Dana 44 AdvanTEK axle. Based on the product title and description, it is for 2018–2022 Jeep Wrangler JL models.
A 4.88 ratio is a numerically higher gear, which adds torque multiplication at low speed and suits the heavier tire setups this kind of axle is often run with.
Because the 4.88 set goes into the front differential, the carrier and the axle type have to match the gears. Confirm the Dana 44 front on your vehicle before ordering, since a mismatch means the gears will not mount correctly.
Key features
- Forged 8620 steel gear pair
- Precision-machined to OE specifications, aimed at quiet operation
- Heat treated for added durability
- Lapped surfaces reduce friction that can lead to noise and wear
Choosing a front gear ratio
The front ratio works with the rear ratio, tire size and transfer case gearing, so a change in one usually calls for a check of the others. A numerically higher ratio pulls harder at low speed and suits larger tires, while a lower ratio is quieter and more economical at highway speed. Before buying, measure the tire diameter and note how the vehicle is used most.
Gears are only one part of the swap. Bearings, shims and the carrier are all reset when the set is installed, and the pinion depth and backlash must be checked with the tooling before the axle is loaded. Expect the surfaces to seat during early use, and check the mesh and fasteners again afterward.
- Confirm the front axle is a Dana 44 AdvanTEK
- Replace bearings and seals with the gear set
- Re-check backlash after the first drives
Specifications
| Brand | G2 Axle and Gear |
|---|---|
| Part number | G/21-2151-488R |
| Axle location | Front |
| Axle type | Dana 44 AdvanTEK |
| Gear ratio | 4.88 |
| Material | 8620 steel, forged |
| Surface | Lapped mating surface |
Vehicle fitment
Based on the product title and description, this 4.88 front set is for 2018–2022 Jeep Wrangler JL models.
The earlier 2007–2018 Wrangler JK is not covered by these years. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
Set pinion depth and backlash with gauges before the 4.88 pair carries load, and expect a break-in period as the surfaces seat.
What’s included
One 4.88 ring and pinion gear set for the front Dana 44 axle.
Not included: the master install parts, such as bearings, shims and the pinion nut.
