Overview
The G2 Axle and Gear 4.88 ring and pinion, part G/21-2149-488, is built for the rear Dana 35 AdvanTEK axle. The product title and description place it in 2018–2022 Jeep Wrangler JL models.
G2 says its Performance Series sets are engineered for the heavier loads of modern performance vehicles. The 4.88 ratio is a numerically higher gear, so it adds torque multiplication at low speed.
The 4.88 pair changes the final drive ratio of the rear Dana 35, so the wheels turn more times for each engine revolution than with a 4.10 or 4.56. That matters most on a JL running bigger tires, where the numerically higher ratio helps the engine keep pace with the extra rolling diameter.
Key features
- Forged 8620 steel for a strong gear base
- Precision-machined to OE specifications
- Heat treated to endure harsh, daily-driven conditions
- Lapped mating surface for a smoother, quieter running surface
- Engineered for the increased loads of performance vehicles
Bigger tires and gear choice
Bigger tires make the axle work harder because they change the effective final drive. A numerically higher ratio helps offset that, restoring some of the low-speed pulling and off-road control that taller tires take away. The trade-off is more engine speed on the highway and somewhat higher fuel use on long trips.
Ring and pinion gears are only one part of the drivetrain. Transmission gearing, transfer case range and tire diameter all feed into how the vehicle behaves, so plan the whole set. Gear wear is often first noticed as a whine under load, and a tooth contact check during setup helps catch problems before the first trip.
- Confirm tire diameter before ordering
- Check the axle shafts when the carrier is out
- Use fresh gear oil after the break-in period
Specifications
| Brand | G2 Axle and Gear |
|---|---|
| Part number | G/21-2149-488 |
| Axle location | Rear |
| Axle type | Dana 35 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 set is for the rear Dana 35 axle in 2018–2022 Jeep Wrangler JL models.
This set is for the rear Dana 35 AdvanTEK axle. Confirm your year, model and trim before ordering, since Dana 44 axles and earlier Wrangler generations need different gear sets.
Installation notes
Pinion depth, carrier preload and backlash all have to be set before a 4.88 pair runs under load. Have a professional set them, and keep the axle supported while the carrier is out.
What’s included
One 4.88 ring and pinion gear set for the rear Dana 35 axle.
Not included: bearings, shims, the pinion nut and the seals needed to complete the install.
