I've spent a lot of time tinkering with my rig lately, and it's clear that choosing the right scx10 iii upgrades can turn a decent trail run into something legendary. The Axial SCX10 III is a fantastic platform right out of the box, but if you're like me, you probably can't leave well enough alone. There's always a steeper rock to climb or a tighter line to navigate, and that's where the fun of upgrading really kicks in.
Getting the Weight Down Low
If you've spent any time on the rocks, you know that a top-heavy truck is a recipe for a bad afternoon. The SCX10 III, especially with a detailed scale body and interior, can get a bit "tippy." The first thing I usually look at when I'm planning my scx10 iii upgrades is how to get the center of gravity (COG) as low as possible.
Brass is your best friend here. Adding brass portal covers or heavy brass hexes puts weight exactly where you want it—unsprung and low. When you add weight to the portals, you aren't stressing the suspension, but you are giving the tires more "bite" into the terrain. I noticed a massive difference in side-hill stability just by swapping the stock plastic portal covers for some heavy brass ones. It keeps the rubber glued to the ground instead of the truck wanting to do a backflip every time the incline gets steep.
The Steering Servo Situation
Let's be real for a second: the stock steering servo that comes with most ready-to-run (RTR) kits isn't built for the long haul. It might work fine on flat dirt, but once you wedge those big tires between two rocks, that stock servo is going to struggle.
Upgrading to a high-torque, waterproof servo is arguably one of the most important scx10 iii upgrades you can make. You want something with at least 300 to 400 oz-in of torque. When you have that kind of power, you can steer out of binds that would have previously stalled your truck. It also makes the whole driving experience feel more precise. Just a heads-up, though—if you go with a super powerful servo, you'll probably want to grab a dedicated BEC (Battery Eliminator Circuit) or make sure your ESC can handle the voltage jump. There's nothing worse than your electronics "browning out" right in the middle of a technical climb.
Better Tires and Foams
You can have all the power in the world, but if your tires are slick or too hard, you're just going to spin your wheels. Most people overlook the tires when thinking about scx10 iii upgrades, assuming the stock ones are "good enough." While the stock Nitto Trail Grapplers aren't bad, moving to a softer compound like Pro-Line's G8 or Predator compound makes a world of difference.
But here's the secret: it's not just about the rubber. It's about the foams inside. Stock foams are often way too soft or too stiff. If they're too soft, the tire rolls over on its sidewall during a turn. If they're too stiff, the tire doesn't "conform" to the rock. Switching to some dual-stage foams—where the inner part is firm to support the truck and the outer part is soft to let the tread wrap around obstacles—is a game changer. It's one of those smaller, cheaper upgrades that actually makes the truck feel like it's cheating.
Powering Up the Electronics
The stock motor and ESC in the SCX10 III are decent for getting started, but if you want that butter-smooth low-speed crawl, you're eventually going to look at brushless systems. Something like the Hobbywing Quicrun Fusion (the 2-in-1 motor and ESC combo) is a very popular choice for these rigs.
The reason people love it is the "FOC" (Field Oriented Control) technology. Basically, it keeps the motor spinning at a constant RPM regardless of the load. If you're slowly inching up a ledge, the motor won't "cog" or jerk; it just stays steady. It gives you incredible control. Plus, since it's a 2-in-1, it clears up a lot of space under the hood, which is always a win when you're trying to keep your wiring neat.
Suspension and Shocks
The SCX10 III comes with oil-filled shocks that are pretty good, but they can be a bit leaky or "sticky" over time. When looking at scx10 iii upgrades for the suspension, you don't necessarily need to replace the whole shock body right away. Sometimes, just changing the shock oil weight or swapping the springs can fix your issues.
If you find the truck is bouncing too much, a slightly heavier oil can slow down that rebound. On the other hand, if you feel like the truck is too stiff, softer springs will help it "settle" into the terrain. If you do decide to go all out and buy new shocks, look for something with a smooth bore and high-quality seals. Brands like Desert Lizard or Vanquish offer some great options that provide a lot of travel without being too bulky.
Transmission and Gearing Tweaks
One of the coolest features of the SCX10 III is the Dig function and the optional two-speed transmission. However, these require extra servos to operate. If you didn't set those up out of the box, adding them is a fantastic way to increase the technical capability of the rig.
The "Dig" feature locks the rear wheels while allowing the front wheels to keep pulling. This lets you pivot the truck around its front end, which is a lifesaver in tight spots where you don't have room to make a wide turn. Also, if you find that your truck is a bit too fast or lacks "oomph" at the bottom end, you might want to look at a smaller pinion gear. Dropping a tooth or two on the pinion is one of the easiest scx10 iii upgrades to increase your torque and slow down your crawl speed for better precision.
Linkages and Durability
The stock links on the SCX10 III are actually quite good because they're stainless steel, which adds some nice weight. But if you're really beating on your truck, you might notice the rod ends starting to get sloppy. Replacing those with high-quality plastic or metal rod ends can tighten up the steering and the suspension feel.
Also, don't forget about the driveshafts. The plastic ones are surprisingly tough, but they aren't invincible. If you're running a high-torque brushless motor and heavy brass weights, those plastic shafts are the "weak link" in the chain. Moving to hardened steel driveshafts is one of those "set it and forget it" scx10 iii upgrades that gives you a lot of peace of mind when you're miles away from your car on a long trail.
Final Thoughts on Building Your Rig
At the end of the day, the best part about this hobby is that there isn't one "correct" way to build a truck. Some people love the scale look with all the accessories, while others want a performance-driven rock crawler that can go anywhere.
My advice is to change one thing at a time. If you do five scx10 iii upgrades at once, you won't actually know which one made the biggest difference. Start with the tires or the steering servo, go for a run, and see how it feels. Then, move on to the brass weight or the electronics. It's a process, and honestly, the building and testing are just as much fun as the actual driving. So grab some tools, get your truck on the bench, and see what you can come up with. See you on the rocks!