Assembled 30T 0.8Mod Steel Differential for ARRMA GROM & LOSI NASCAR AWD RC Cars

This 30-tooth, 0.8-module steel differential from RcThjia is a factory-assembled replacement for front or rear axles on select ARRMA and LOSI RC cars. It fits the 1/18 Granite and Typhon GROM, the 1/14 Mojave GROM, and the 1/12 LOSI NASCAR AWD. The internal gears are made from hardened steel for durability, and the unit comes pre-filled with grease so it's ready to install out of the box.

Compatibility & Fitment

This differential is designed specifically for the following vehicles: ARRMA 1/18 GRANITE GROM, ARRMA 1/18 TYPHON GROM, ARRMA 1/14 MOJAVE GROM, and LOSI 1/12 NASCAR AWD. It can be used in either the front or rear position. While the dimensions match the original parts, we recommend comparing the overall size with your stock unit to confirm a perfect fit.

Build Quality and Materials

The outer casing is made from high-quality metal, and the internal gears are upgraded steel—stronger than the stock plastic or sintered metal gears found on many RTR models. This upgrade helps the drivetrain handle more power and run more efficiently. The differential is assembled and lubricated at the factory, but if you prefer a different grease weight or want to inspect the internals, you can open it up and re-lubricate it yourself.

Installation and Setup

Because the differential matches the original dimensions, installation is straightforward. Remove the old differential, swap in this unit, and reassemble the axle. The pre-installed grease means there's no need to add lubricant before running. We do suggest checking the mesh and ensuring the shimming is correct for your specific vehicle, as tolerances can vary between models.

Technical Specs

Common Questions

Does this differential come ready to install?

Yes, it is factory assembled and filled with grease. You can drop it in and run immediately.

Can I use this as a rear differential in a 1/14 Mojave GROM?

Yes, it works in both front and rear positions on the Mojave GROM and other compatible models.

Is this stronger than the stock differential?

The steel internal gears are an upgrade over the stock plastic or powdered metal gears, offering better durability under higher power.

What warranty does RcThjia provide?

The manufacturer offers a longer warranty period and a professional support team to help with any issues. Check the product listing for specific warranty details.