Overdrive Gear Set 22T And 12T And Underdrive Gear Set 24T And 10T For TRX4M RC Crawler Helical Steel Differential With Spool Locker Replacement Kit Included

TRX4M Crawler Overdrive/Underdrive Gear Set with Spool Locker
✔️ 22T/12T overdrive and 24T/10T underdrive gears with locker

This steel helical differential gear set is designed for 1/18 scale TRX‑4M crawlers, replacing the stock gears for improved durability and smoother operation in terrain crawling scenarios.

✅ Overdrive gears: 22T/12T (10% overdrive)
✅ Underdrive gears: 24T/10T (16% underdrive)
✅ Includes spool locker for stock gear replacement
✅ Steel helicals for TRX‑4M differential compatibility

💡 What is an overdrive/underdrive gear set used for in RC crawlers?

In short, these gears balance torque and wheel speed for steadier crawling. - Overdrive increases front axle speed for quicker steering response - Underdrive slows the front axle, boosting traction on climbs - They let you tune handling without swapping motors or ESC ✝️