Best TRX4M Upgrades (That Actually Improve Performance)
Photo by Omar Ramadan: https://www.pexels.com/photo/atv-car-parked-on-rough-stony-terrain-7153322/
Best TRX4M Upgrades (That Actually Improve Performance)
The TRX4M is great out of the box — but with the right upgrades, it becomes a completely different crawler.
Here are the best upgrades that make a real difference.
If you’re running a custom build or a pre-modded crawler, it’s also worth checking the Top 10 FairRC Mods to Consider for more scale-focused setups and BATRAZZI upgrade ideas.
Most TRX4M upgrades don’t actually improve performance — they just look good.
These are the ones that actually make a difference on the rocks.
1. Steering Servo Upgrade (Must Have)
INJORA INJS2065 7KG Waterproof Digital Servo
The stock servo is weak. This fixes it immediately.
- Much stronger steering
- More precise control
- Fully waterproof
👉 If you only do one upgrade, do this first.
👉 This is one of the most popular upgrades right now — for a reason.
2. Brass Wheels / Weights
INJORA Brass Beadlock Wheels
Weight low = better performance.
- Lower center of gravity
- More traction
- Better stability on climbs
- Better looks
👉 This is what makes your crawler feel planted.
👉 This is one of the easiest ways to improve stability without changing your setup.
3. Tires (Biggest Performance Gain)
INJORA King Trekker Tires
Stock tires are average — these are not.
- Massive grip improvement
- Better rock crawling
- More control on technical lines
👉 Tires change everything. Don’t skip this.
👉 This is one of the most popular upgrades right now — for a reason.
4. Helical Gear Set (Overdrive / Underdrive)
INJORA Steel Helical Axle Gears
This is where performance gets serious.
- Better climbing control
- Smoother drivetrain
- Improves technical crawling
👉 Ideal if you want more control on rocks.
5. Shock Absorbers Upgrade
INJORA 59mm Oil-Filled Shocks
Stock shocks are basic — these are much smoother.
- Better damping
- More stability
- Adjustable setup
👉 Helps your crawler stay stable on uneven terrain.
6. High Clearance Links
INJORA Aluminum Links Set
Improves geometry and clearance.
- Less drag on rocks
- Better articulation
- Stronger than stock
👉 Small upgrade, noticeable difference.
7. Driveshaft Upgrade
INJORA Steel Driveshaft
Stock ones wear out — this solves it.
- More durable
- Handles torque better
- Long-lasting
👉 Important if you upgrade power later.
8. 180 Brushed Motor Upgrade
INJORA 48T / 55T Motor
More torque, better crawling control.
- Smoother low speed
- Stronger climbs
- Better throttle control
👉 Great upgrade for technical crawling.
🔥 Want Pro-Level Performance?
If you’re ready to push your TRX4M further, these upgrades take it to the next level.INJORA CNC Aluminum Complete Transmission with 180 Brushed Motor
More efficient drivetrain
Stronger and more durable
Smoother power delivery
INJORA CNC Aluminum Complete Axles
Increased durability
Better steering angle
Handles extreme crawling
INJORA Brass High Clearance Links
Extra low weight
Improved stability
Better obstacle handling
INJORA LCG Carbon Fiber Chassis Kit
Lower center of gravity
Better balance
More advanced setup
Further reading:
Most people waste money upgrading the wrong parts first.
If you skip servo, tires and weight, nothing else will feel right.
Final Thoughts
If you want the best results, follow this order:- Servo
- Brass Wheels (weight & visual combined)
- Tires
- Gears
- Everything else
(Tires or brass wheels can be swapped depending on your setup and terrain.)
Don’t overcomplicate it.
Start with servo, brass wheels and tires — that alone will completely change your crawler.
Image credits: Aliexpress / Injora / Traxxas / Retailers
Images sourced from AliExpress product listings (INJORA Official Store and related sellers) under affiliate partnership.
Affiliate Disclosure: This article may contain affiliate links. Purchases may earn a commission at no extra cost.
#trx4m #rccrawler #injora #rccars #scalecrawler #rccrawlerlife #traxxas #rccarupgrade #rc4x4 #crawlerbuild
Looking for more TRX4M upgrades? This guide will be updated as new parts are tested.
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