This page includes affiliate links. If you buy through them, RC Tech Tips may earn a commission at no extra cost to you. Before ordering Slash parts, confirm your exact model, part number, battery connector, charger support, and whether the listing is for one part, a pair, or a full set.
Quick Answer: What Should You Upgrade First?
The best Traxxas Slash upgrade depends on what is limiting your truck. For most bashers, start with durability parts or shocks before chasing more speed. Upgrade the servo if steering feels weak, upgrade shocks if the truck bottoms out or leaks oil, and move to 3S only after the ESC, motor, battery tray, connector, charger, and driver are ready.
If you have not bought the truck yet, compare the cost of parts against the factory-upgraded Slash 4X4 Ultimate first. If you already own a Slash, upgrade by the problem you are trying to solve instead of buying every aluminum part you see.
| Upgrade path | Problem it solves | Best for | Avoid if | Check before buying |
|---|---|---|---|---|
| Slash 4X4 Ultimate | Factory-installed upgrade package | Buyers who have not bought a Slash yet | You already own a good Slash and only need one weak point fixed | Exact model, battery and charger status, color, seller, and whether the higher upfront cost beats upgrades |
| Shocks | Bottoming, leaking caps, rough landings, weak damping | Jumping, track use, rough yards, and heavier/faster setups | You only need a cheap stock shock repair | 2WD vs 4X4, front/rear length, pair vs set, springs, oil, and hardware |
| Servo | Weak, slow, or vague steering | Drivers who want better control before adding more speed | The stock steering feels fine for your surface | Servo fit, servo saver, spline/horn, voltage, waterproof claim, and hardware |
| HD arms and durability parts | Broken suspension parts | Bashers who hit curbs, jumps, and cold-weather landings | You are buying aluminum arms for looks instead of impact behavior | 2WD vs 4X4 part numbers, front/rear position, color, pins, and hardware |
| Battery and charger | More speed or runtime | Owners with a 3S-rated setup and safe charging plan | Your model is not rated for 3S or you do not have a LiPo balance charger | ESC rating, connector, battery tray, low-voltage detection, charger mode, and cell count |
Should You Upgrade Your Slash Or Buy The Ultimate?
If you are still shopping for a Slash, the Slash 4X4 Ultimate can be smarter than buying a base model and upgrading part by part. Traxxas lists the current Ultimate as a 1/10 4WD short-course truck with the VXL-3s system, Low-CG chassis, heavy-duty suspension arms, sway bars, GTR shocks, and other factory-installed upgrades. That does not mean every owner should buy the Ultimate, but it does set the comparison point.
Buy the Ultimate if you want the upgraded 4X4 package from day one and the price gap is smaller than the parts you were already planning to add. Upgrade your current Slash if you already own the truck, only one area is weak, or you prefer changing parts as they break.
For the full truck-to-truck decision, read the Traxxas Slash Ultimate vs VXL guide before buying duplicate parts.
Traxxas Slash 4X4 Ultimate
Traxxas 68277-4-GRN - Slash Ultimate 1/10 4X4 Short Course Truck RTR, Green
Best for: drivers who want a factory-upgraded Slash 4X4 with strong parts support
Avoid if: buyers who need the lowest upfront price or a monster-truck stance
Verify exact Slash 4X4 Ultimate model number, battery and charger status, seller, color, and optional gearing caveats before buying.
Buy on AmazonWhich Shock Upgrade Should You Do First?
Shocks are usually the first serious Slash upgrade because they affect landings, cornering, ride height, and how predictable the truck feels. On my Slash 4X4 VXL, the stock shock caps were the first track weak point after bigger jumps. That does not mean everyone needs expensive shocks immediately, but it does mean suspension should be high on the list if the truck is leaking, bottoming, or bouncing.
Traxxas GTR shocks are the premium Traxxas-native path when you want threaded collars and separate tuning options. Big Bore shocks are the simpler set-of-four Traxxas path. Pro-Line PowerStroke shocks can also work well for drivers who want more tuning range, but they deserve a separate fitment check because front and rear pairs are easy to mix up.
GTR shock buying checks
Traxxas GTR long shocks
Traxxas 7461G GTR Long Hard Green Anodized Shocks (2) (Front) (for The Rustler 4x4 and Slash 4x4)
Best for: Slash owners who want a Traxxas-native front/long GTR path
Avoid if: Drivers who want a complete four-shock kit in one box or do not want separate spring checks
Confirm 7461-family long length, pair quantity, color/version, Slash fitment, and springs sold separately.
Buy on Amazon
Traxxas GTR XX-long shocks
Traxxas TRA7462 Shocks, GTR xx-Long Blue-Anodized, PTFE-Coated Bodies with TiN shafts (2)
Best for: Slash owners completing the GTR long/XX-long setup
Avoid if: Readers who have not confirmed springs or rear XX-long fitment
Confirm 7462-family XX-long length, pair quantity, color/version, rear fitment, and springs sold separately.
Buy on Amazon
Traxxas XX-long GTR springs
7449 Spring, Shock, White GTR Long .767, Black Rate, 5-Pack
Best for: Readers who need a spring check after choosing XX-long GTR shocks
Avoid if: Readers who need a universal spring or oil solution
Use only if 7449 XX-long spring length and rate match the setup; shock oil choice still needs separate tuning judgment.
Buy on AmazonIf you want the deeper shock comparison, start with the Traxxas Slash shock upgrade guide. If you are choosing between Pro-Line and Traxxas parts, read Pro-Line vs Traxxas GTR shocks.
Traxxas Big Bore shock set
Traxxas 5862 Big Bore Shock Set, Complete with Springs
Best for: drivers who want a practical handling and durability upgrade
Avoid if: drivers who want threaded GTR tuning or unrelated scale shocks
Verify 5862 set contents oil spacers and Rustler fit before buying.
Buy on AmazonShould You Upgrade The Steering Servo?
Upgrade the servo when the truck has enough traction but the steering still feels weak, slow, or inconsistent. A stronger servo can make the Slash easier to place before jumps and cleaner through turns, but it is not the first part every backyard driver needs.
Before buying a servo, verify the case size, spline or horn fit, servo saver compatibility, waterproof claim, voltage support, and whether extra hardware is needed. For a deeper servo comparison, use the best servo for the Traxxas Slash guide.
Are Heavy-Duty Arms Better Than Aluminum Arms?
For most bashers, heavy-duty composite arms are usually a safer first durability upgrade than aluminum arms. A suspension arm needs some controlled flex in crashes. Aluminum arms can look strong, but they can also transfer impact into hinge pins, bulkheads, or other parts that are more annoying to replace.
Traxxas shows HD suspension arms as the first phase in its Slash upgrade path, and the Slash 4X4 Ultimate also uses heavy-duty suspension arms. That is the direction I would use for most drivers who break arms. Save aluminum for compact parts where rigidity makes more sense, such as steering blocks, caster blocks, rear hub carriers, shock towers, or other model-specific hop-up parts after you have checked fitment.
- For Slash 2WD HD arms, verify front and rear part numbers separately.
- For Slash 4X4 HD arms, verify that the listing is for the 4X4 platform, not the 2WD truck.
- Check whether the package is one pair, front/rear set, or only one side.
- Do not assume a color option means the same part fits every Slash model.
When Is A 3S Battery Upgrade Worth It?
A 3S LiPo upgrade is worth considering only when your Slash model, ESC, motor, battery tray, connector, charger, and driving space are ready for it. Traxxas lists 2S and 3S LiPo support for VXL-3s setups, but that does not make 3S the right choice for every driver. Extra voltage adds speed, heat, crash energy, and parts wear.
Before ordering a battery, read the 2S vs 3S LiPo battery guide and confirm your RC battery connector type. For LiPo safety, use a LiPo-specific balance charger, keep low-voltage detection on for LiPo use, do not charge damaged packs, and do not leave packs unattended while charging.
Traxxas battery and charger checks
Traxxas 3S iD pack option
Traxxas 2832X 5000mah 11.1v 3-cell 25c Lipo Batte
Best for: Traxxas owners with a model and charger that are rated for this 3S iD pack
Avoid if: Traxxas owners who have not checked model rating, connector, tray size, low-voltage mode, or charger support
Verify exact Traxxas model compatibility, iD charger support, pack size, connector, and 3S rating before buying.
Buy on Amazon
Traxxas EZ-Peak iD charger
Traxxas 2971 EZ-Peak Live 12-Amp NiMH/LiPo Fast Charger with ID Technology Vehicle
Best for: Traxxas owners who need a matching iD charger path before running LiPo packs
Avoid if: Readers who need a general non-Traxxas balance charger or have not checked chemistry and connector support
Verify charger chemistry, cell count, connector support, AC power needs, battery type, and manual before buying.
Buy on Amazon
Traxxas battery and charger completer pack
Traxxas 2995 RC Car and Truck 7600mAh 7.4 Volt 2 Cell Performance LiPo Battery and EZ Peak Charger Completer Pack
Best for: Traxxas owners looking for a matching ecosystem pack and charger path
Avoid if: Readers who have not verified vehicle fit cell count connector charger and LiPo safety setup
Verify vehicle fit, battery size, connector, charger, cell count, and LiPo safety setup before buying.
Buy on AmazonWhat Aluminum Parts Are Actually Worth Buying?
Aluminum is not automatically bad, but it needs to be used in the right places. Compact steering and hub parts can make sense when the fitment is correct. Aluminum shock caps or complete aluminum shock bodies can also solve real problems. Aluminum suspension arms are the part I would be most careful with on a basher because arms are supposed to absorb impact.
Use this rule: buy aluminum when it solves a known failure or tuning problem, not just because it looks like an upgrade. If the truck mostly sees curbs, skatepark hits, or cold-weather crashes, flexible HD composite parts may keep the rest of the suspension alive better than rigid aluminum arms.
Slash Upgrade Path By Problem
| If this is happening | Start here | Do not skip |
|---|---|---|
| Shock caps pop, oil leaks, or the truck bottoms hard | Shock repair, Big Bore, GTR, or Pro-Line shock path | Front/rear length, springs, oil, pair count, and model fit |
| Suspension arms break during bashing | HD composite arms before aluminum arms | 2WD vs 4X4 part numbers and hardware |
| Steering feels weak after tires or power upgrades | Servo and servo saver check | Spline/horn fit, voltage, waterproofing, and end points |
| The truck pushes, rolls, or loses grip | Tires, shock oil, springs, ride height, and sway bar setup | Surface and driving style; one setup will not work everywhere |
| You want more speed | Confirm ESC rating, gearing, battery, charger, and heat first | Low-voltage detection, battery tray, connector, and safe charging |
| You are buying your first Slash | Compare base/VXL models against the Ultimate | Battery and charger inclusion, actual upgrade cost, and skill level |
Helpful Source Checks
- Traxxas shows HD suspension arms, aluminum steering parts, a high-torque servo, Big Bore shocks, and Velineon power as staged Slash upgrade paths in its 3-phase Slash upgrade article.
- The Slash 4X4 Ultimate product page is the check for current Ultimate model features, model number, electronics, battery compartment, and whether battery/charger are sold separately.
- The Traxxas 5862 Big Bore page is the source to check for kit contents, shock oil, spring notes, and application fit.
- Traxxas Battery Basics is the safety check for LiPo charging, low-voltage detection, balance charging, and storage habits.
Traxxas Slash Upgrades FAQ
What Should I Upgrade First On A Traxxas Slash?
For most Slash owners, upgrade the part that is limiting the truck right now. Start with shocks if it leaks or bottoms out, HD arms if you keep breaking suspension parts, a servo if steering is weak, and batteries only after the power system and charger are ready.
Are Aluminum Parts Worth It On A Traxxas Slash?
Some aluminum parts are worth it, especially compact steering, hub, shock, or tower parts with verified fitment. Aluminum arms are more questionable for bashers because rigid arms can transfer crash force into other parts.
Should I Buy A Slash Ultimate Instead Of Upgrading?
Buy the Slash Ultimate if you have not bought a truck yet and you already want the factory 4X4 upgrade package. Upgrade in pieces if you already own a Slash or only need to fix one weak area.
Can A Traxxas Slash Run 3S LiPo?
Some Traxxas Slash models can run 3S LiPo, especially VXL-3s setups, but you must verify your exact model, ESC, motor, connector, charger, battery tray, and low-voltage detection before using 3S.
What Upgrades Fit Both Slash 2WD And Slash 4X4?
Do not assume a Slash part fits both 2WD and 4X4 models. Shocks, arms, steering parts, towers, driveshafts, and hardware can differ, so check the part number and model application before ordering.
