INJORA 40.3:1 Stainless Steel Transmission Gear Set for TRX4M

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.

It's too bad these are hidden away in a casing as they are beautifully finished and nice to look at. During the installation, I also installed sealed bearings. I am amazed at the crawling abilities these gears create. Along with some other upgrades I made at the same time, my Traxxas 1/18 scale Land Rover Defender climbs over the four obstacles I build in the yard almost like it's flat land. Yes, top end speed is reduced but, so what. I wanted crawling ability and that's exactly what I got! I feel that with the installation of these low range gears a brushless motor is no longer required, although, a brushless motor gives good low speed modulation and a good top end. I'll sacrifice top end for crawling ability and just a $13 price tag.

Dropped right in and ran without any issues

This was a perfect upgrade. Simple to install. Great quality. I would recommend

If you want to make your TRX4M a crawler these are what you need. I was so impressed with the slow speed crawl and control I had over the car. I did switch back to the stock ones because I use my rc to chase my dogs sometimes. They fit perfectly, recommend to get bearing for your transmission. My personally I'll probably build a high speed transmission and a low speed transmission or maybe just but another rc.

These 16.6:1 gears are faster than stock, not quite as fast as the high gear plastic ones, but they also offer 9.7:1 ratio gears for those who want speed. But these are perfect for both worlds, with the Brushless upgrade, you can crawl super slow and have some bashing fun. Only thing I'd recommend is that you buy an upgraded steel pinion from someplace like mofo RC because it will strip the brass pinion under stress/grass driving

Made a big difference all around definitely worth the money easy to install really good product. Would recommend to anyone with a TRX 4M injora transmission.

Love it works great, extremely less noisy then any other gear set I've used. Easy to pur together make sure you assblu correct or it will bind . This is the second set of gears I've done i have crawling gears and the one gears . Ofcouse the steel will make it heavier than oe gears but the will last much longer than the plastic.

Très bonne compatibilité. Mais le trx-4m est devenu beaucoup plus bruyant. C'est dommage.

Perfect thanks

4 étoiles, une en moins pour le bruit, car beaucoup plus bruyant que les pignons en plastique. Excellent pour le crawling,plus facile à contrôler en basse vitesse que les pignons de stock et plus de couple. Plus lent en vitesse de pointe. Donc pour le crawling : ok . ]our le trail : préférer un pignons de 16.

I wanted to slow my stock TRX-4M a bit to enable better crawling speed and ordered these metal gears to replace the stock plastic ones. They fit perfectly and should last forever as they are metal and not plastic. The kit includes a metal 11T pinion, but there are no instructions in this kit and I wasn't able to get it to fit the stock motor. I ended up buying another 87T motor from another company that came with a brass 11T pinion, which means my transmission is all metal gears now. The kit also included some small decals which was nice. I recommend this item

Si perde velocità di punta, ma si guadagna una precisione incredibile sugli ostacoli. Rapporto qualità-prezzo imbattibile per l'upgrade della trasmissione. Promossi a pieni voti!