INJORA15g Stainless Steel 40.3:1 Low Range Transmission Gear Set for TRX4M 1/18 RC Crawler Car Upgrade

TL;DR Only one run, so far so good. Running brushless Furitek.Update March 2025. Almost 2 years on these gears and still working great. Still highly recommend this if you want to rock crawl. Too slow for trail or general purpose driving, but a must have if you’re looking for more torque and slow speed crawling. I’ve had no issues out of these gears (or anything on my 4M for that matter)Update: April 2024, 1 year later still runs like the day I installed. I don’t drive it every day but at least a couple times per week. Would buy again.Original review:Installed in my Bronco running bearing kit and the Furitek brushless motor/esc. Gears dropped right in no fitment issues. There has been a clicking ever since installing the new motor but the plastic crawler gears from Traxxas also made a clicking. So I just run it. Worth noting though. These gears appear to be nicely machined. If you’re into rock crawling with your TRX4m, I’d suggest this as your first upgrade along with bearings second. Those two upgrades even on the stock motor and electronics make it a whole new truck. The torque of the stock motor is actually pretty good with the crawl gears. I bought these injora gears because I thought that I had stripped the plastic ones causing them to click when driving, turns out these click too. The quality of injora parts is excellent. I’m also running their brass differential covers front and rear. So far these are a 5 star all day. If anything happens, I’ll update my review.

These worked perfectly. Just the right gearing! Very well machined and smooth!

Super high quality, with great tolerances. Easy fit, no binding, or grinding.

Running the stock plastic cases so they are louder but the crawling speed is perfect. Added extra grease to keep them happy.Installing the motor gear is simple use some channel locks to not stress the motor shaft and take your time to make it go on straight.

Striped a gear on one of my JJRC c8808 and put an Injora motor and transmission in it. Decided to throw these in the original and installed it in a JJRC c8813 and really happy with how it turned out

made my trx4m way smoother and has loads more torque good buydon't forget small amount of grease

Very nice gear set! I do more crawling with my TRX4M than trailing, and the stock gears are not the best for crawling low speed. This gear set fixed that! The low speed modulation is so much better. I'm running the stock motor. Just make sure to use an ample amount of grease on the gears. And also, the pinion gear is a little difficult to get on the motor shaft. I had to use a C clamp and slowly press it on. Just go easy, because you don't want to bend the motor shaft. Other than that, the install was flawless, and it completely transformed how my TRX4M drives.

Perfect fit