INJORA 18T Underdrive Worm Differential Steel Gears for Axial SCX24 RC Crawler Upgrade

The INJORA 18T Underdrive Worm Differential Gears are steel upgrade components for 1/24 RC crawlers like the Axial SCX24 series. Weighing 4g per set, these gears reduce axle speed by about 11% compared to stock, and use a worm drive design for increased ground clearance. They are a direct fit for the entire SCX24 lineup, including the C10, JLU, Gladiator, Bronco, and Deadbolt models.

How these gears change your SCX24's performance

Installing the 18T underdrive gears slows the axle rotation relative to the driveshaft. This gives you more torque at the wheels and finer throttle control on technical terrain. The worm gear setup—a worm screw and worm gear in each differential—raises the axle tube, boosting ground clearance over stock components. The etched tooth count on the pinion gear makes identification simple during installation.

What's in the set and how to identify them

This set includes four gear types: pinion, ring (worm), and associated parts. Each pinion has its tooth count etched into the metal for easy recognition. The total weight of the complete set is 4 grams, making them a lightweight but durable steel upgrade over plastic factory parts.

Compatibility with Axial SCX24 models

• Axial SCX24 C10
• JLU Jeep Wrangler
• Gladiator JT
• Ford Bronco
• Deadbolt
• Other SCX24-based trucks

This gear set is designed specifically for the 1/24 SCX24 platform. No modifications are required for fitting into the stock differential housings.

Will underdrive affect my truck's climbing?

Yes. The supplied note explains that using underdrive in the rear (or overdrive in front) makes the front axle pull faster than the rear. This helps the truck climb better and reduces the chance of tipping over backward. Because this set is an underdrive, using it on the rear axle (or keeping the front stock) creates that pulling effect. Experiment with front vs. rear placement to tune your truck's handling.

Specifications at a glance

Frequently asked questions

Can I install these gears in any SCX24 model?

Yes, they suit the entire SCX24 platform, including the C10, JLU, Gladiator, Bronco, and Deadbolt.

What is the exact weight of the gear set?

The set weighs 4 grams.

How does underdrive improve climbing?

Underdrive in the rear (or overdrive in front) makes the front axle rotate faster, which pulls the truck forward on obstacles and reduces the risk of flipping backward.

Are these gears compatible with other differentials?

The data provided does not specify compatibility beyond SCX24 models. They are designed specifically for that platform.