Overview
The G2 Axle and Gear 4-YJ-410 is a front and rear 4.10 ring and pinion kit for a Dana 30 front axle and a Dana 35 rear axle. The kit also includes matched Master Installation Kits for both ends, so a complete gear swap is covered by one box.
A ring and pinion set is the gear pair inside a differential that turns driveshaft rotation into axle rotation. A 4.10 ratio means the pinion turns 4.10 times for each turn of the ring gear, which gives quicker acceleration than a numerically lower ratio at the cost of higher engine speed on the highway. The gears are computer heat treated 8620 steel, double shot peened and double lapped.
One point needs care before ordering: the title says YJ, yet the feature list for this kit reads “1984 to 1999 XJ Cherokee”. The two statements do not agree, so no single vehicle is confirmed here.
Key features
- Front and rear gear sets in one kit
- 4.10 ratio on both axles
- Designed for a Dana 30 front axle (Dana 30 Reverse) and a Dana 35 rear axle
- Includes front and rear matched Master Installation Kits
- Computer heat treated 8620 steel
- Double shot peened and double lapped
- Manufactured to O.E. specifications
- Limited lifetime warranty from G2
Matching gears on both axles
Running the same ratio on the front and rear axles keeps both ends turning at matched speeds under load, which reduces driveline stress. A matched kit simplifies this because both gear sets and their installation kits come from one package. Before starting, confirm which axle housings you have, since the front and rear gears must match their own axle type.
Tire diameter changes the effective ratio, so a larger tire will feel less responsive than the gearing alone suggests. Expect a break-in period after the swap, and keep speeds moderate while the new contact patterns settle. Keep the rear axle breather clear and inspect the seals after the first drive.
- Confirm front and rear housings before ordering
- Keep each installation kit with its own axle
- Set pinion depth and backlash on both differentials
- Refill with fresh gear oil once both housings are closed
Specifications
| Brand | G2 Axle and Gear |
|---|---|
| Part number | 4-YJ-410 |
| UPC | 700007521651 |
| Gear ratio | 4.10 |
| Front axle | Dana 30 Reverse |
| Rear axle | Dana 35 |
| Axle location | Front and rear |
| Material | Computer heat treated 8620 steel |
| Finishing | Double shot peened, double lapped |
| Warranty | Limited lifetime (G2) |
Check the contents of each installation kit against your gear swap before starting.
Vehicle fitment
G2 has not published a vehicle list for the 4-YJ-410. The title says YJ, the feature list says 1984 to 1999 XJ Cherokee, and the attribute table gives a Dana 30 Reverse front axle with a Dana 35 rear axle and a general fit label.
Since those statements conflict, treat the axle pairing as the dependable detail: the kit is for Dana 30 Reverse in front and Dana 35 in back. Ask G2 which vehicle it was built for if your axles are not obviously that pair.
Not confirmed: any vehicle beyond those named in the title and feature list. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
Both differentials need pinion depth, backlash and tooth contact pattern set during assembly, which is why gear swaps usually go to a shop with the right gauges. After installation the new 4.10 gears need a gentle break-in period.
The matched Master Installation Kits let the front and the rear be rebuilt in the same session.
What’s included
- Front ring and pinion gear set, 4.10 ratio
- Rear ring and pinion gear set, 4.10 ratio
- Front matched Master Installation Kit
- Rear matched Master Installation Kit
Not included: gear oil and other fluids.
