Overview
The G2 Axle and Gear 5.13 ring and pinion, part G/21-2149-513, is a rear Dana 35 AdvanTEK gear set. Based on the product title and description, it fits 2018–2026 Jeep Wrangler JL models.
At 5.13, this is the most numerically aggressive ratio in this group. It multiplies the most torque at low speed and runs the engine faster at a given road speed.
A 5.13 is a numerically high ratio, so the wheels turn the most times per driveshaft revolution of the group. It suits trail driving with heavier loads or larger tires, where low-speed control counts for more than cruising efficiency.
Key features
- Forged 8620 steel gear pair
- Machined to OE specifications with tight tolerances for easier setup
- Heat treated for added durability
- Lapped surfaces for smoother running and less friction
- Built for the increased loads of performance vehicles
Trail driving with high ratios
A 5.13 ratio is aimed at slow, technical work where wheel control matters more than cruising. It multiplies torque strongly, which helps on steep climbs and crawling terrain. The cost shows up on the road, where the engine runs faster and noise can rise, so many owners keep a separate setup for highway use.
A high numerical ratio demands careful setup. Pinion depth, carrier preload and backlash all shape how the gears wear, and a tooth contact pattern check confirms the setup is right. Heat and friction build quickly if the mesh is off, so the first few runs should be short and monitored.
- Verify backlash with a dial indicator
- Check gear oil level after the first runs
- Keep a log of noise changes during break-in
Specifications
| Brand | G2 Axle and Gear |
|---|---|
| Part number | G/21-2149-513 |
| Axle location | Rear |
| Axle type | Dana 35 AdvanTEK |
| Gear ratio | 5.13 |
| Material | 8620 steel, forged |
| Surface | Lapped mating surfaces |
Vehicle fitment
Based on the product title and description, this 5.13 set is for the rear Dana 35 axle of 2018–2026 Jeep Wrangler JL models.
Other Wrangler years, including the 2007–2018 JK, are not covered by these dates. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
A ratio this numerically high changes engine speed a great deal, so the gear pattern and backlash need checking after install. A professional setup with a break-in period is the normal route for a set like this.
What’s included
One 5.13 ring and pinion gear set for the rear Dana 35 axle.
Not included: carrier bearings, pinion bearings, shims and the other install parts needed to fit the gears.
