Product Details
This high-quality 43T Spiral Main Diff Gear is the perfect part to carry in your RC tool box.
Includes - 1 x Main Diff Gear 43T Spiral GP4 5mm
Requires- Requires 29mm diff case (ARA310983 or ARA311061) and to be used with ARA310979.
- Manufacturer: ARRMA
- Model Number: Z-ARA310980 (ARRMA part number ARA310980)
- EAN: 5052127036399
- Part Type: Main Diff Gear / Gears
- Component Category: Drivetrain / Transmission
- Tooth Count: 43 teeth
- Gear Profile: Spiral-cut
- Tooth Profile: Wide tooth profile
- Material: Machined steel
- Configuration: GP4 (to be used with GP4 Main Input Gear)
- Bore Diameter: 5mm
- Diff Case Compatibility: 29mm diff case
- Compatible Diff Cases: ARA310983 or ARA311061
- Required Mating Gear: ARA310979 Main Input Gear 10T Spiral Cut GP4 5mm
- Manufacturing: Precision manufactured with precision-engineered gear teeth
- Performance Features: Spiral-cut wide tooth profile increases torque handling capabilities
- Operation Characteristics: Smooth operation in extreme RC conditions
- Compatibility Models Include: ARA7612 1/7 Big Rock 6S, ARA7618 1/7 Fireteam 6S, ARA106058 1/7 Mojave 6S, ARA7604V2 1/7 Mojave 6S, ARA7204 1/7 Mojave EXB, ARA106053 1/8 Kraton 6S Roller, ARA106040 1/8 Kraton 6S RTR, ARA8608V5 1/8 Kraton 6S RTR, ARA8608V6 1/8 Kraton 6S RTR, ARA8708V6 1/8 Kraton EXB 6S RTR, ARA8708T1 1/8 Kraton EXB AVC 6S RTR, ARA106044 1/8 Notorious 6S RTR, ARA8611V5 1/8 Notorious 6S RTR, ARA8611V6 1/8 Notorious 6S RTR, ARA106042 1/8 Outcast 6S RTR, ARA106060 1/8 Outcast 6S Limited Edition RTR, ARA8710 1/8 Outcast EXB AVC 6S RTR, ARA106048 1/8 Talion 6S RTR, ARA8707 1/8 Talion EXB AVC 6S RTR
- Package Contents: 1 x Main Diff Gear 43T Spiral GP4 5mm
- Installation: Fits onto 29mm diff case
Overview
The ARRMA Main Diff Gear 43T Spiral 29mm Diff Case GP4 5mm is an essential replacement and upgrade component for serious RC enthusiasts in the UK who demand reliability and performance from their RC cars and trucks. Whether you're running an ARRMA Kraton, Talion, Notorious, Outcast, Big Rock, Fireteam or Mojave model, this precision-engineered differential gear is the perfect part to carry in your RC tool box for maintenance, repairs or performance tuning. Designed and manufactured by ARRMA, a leader in high-quality brushless RC vehicles, this spiral-cut main diff gear represents the engineering excellence that goes into every component of their range of 4WD RC monster trucks, speed trucks and desert buggies.
This 43-tooth main differential gear is engineered to deliver smooth, reliable power delivery to your RC truck's drivetrain whilst handling the extreme torque demands of high-performance driving. The spiral-cut design with wide tooth profile sets this component apart from standard gears, providing superior torque handling capabilities that make it ideal for bashers, racers and competitive drivers who push their RC models to the limit. With a reputation for durability and consistent performance in all conditions, the ARRMA Main Diff Gear 43T is a trusted choice for RC enthusiasts across the UK.
If you own or are planning to purchase an ARRMA 1/7 or 1/8 scale brushless RC truck, having quality replacement gears on hand is essential for keeping your model running at peak performance. This main diff gear is machined from tough steel and precision manufactured to exacting tolerances, ensuring that every tooth meshes perfectly with the 10T spiral-cut GP4 main input gear for smooth, quiet operation even in extreme RC driving conditions.
Key Features
- 43-Tooth Spiral-Cut Design — The 43-tooth count and spiral-cut profile are specifically engineered to work seamlessly with the GP4 main input gear (ARA310979), creating a gear ratio optimised for speed and torque delivery across a wide range of driving conditions and terrain types found throughout the UK.
- Machined Steel Construction — This main diff gear is machined from tough, high-grade steel rather than plastic or lower-quality materials, ensuring long-lasting durability and consistent performance even when subjected to the extreme stresses of high-speed driving, jumps, hard landings and rough terrain bashing.
- Wide Tooth Profile — The precision-manufactured wide tooth profile increases torque handling capabilities significantly compared to standard gears, allowing the differential to transmit power more effectively and reliably without slipping or stripping teeth under load.
- Precision Manufactured Teeth — Each tooth is manufactured to exacting tolerances using precision machining equipment, ensuring smooth meshing with the mating input gear and delivering quiet, vibration-free operation in extreme RC driving conditions such as high-speed racing, bashing and competitive events.
- GP4 Configuration — This main diff gear is specifically designed as part of ARRMA's GP4 drivetrain system, meaning it is engineered to work with the GP4 main input gear (ARA310979) and the 29mm diff case housing for optimum compatibility and performance.
- 29mm Diff Case Compatibility — The 43T main diff gear fits directly onto 29mm diameter diff case assemblies, making it compatible with ARRMA models equipped with the ARA310983 or ARA311061 diff case housings, simplifying installation and ensuring proper fitment.
- Quality Replacement Component — Whether replacing a worn original gear or upgrading to this performance component, the ARRMA Main Diff Gear 43T provides the quality and reliability expected from official ARRMA parts, backed by the manufacturer's reputation for engineering excellence.
Technical Performance
The ARRMA Main Diff Gear 43T Spiral represents the pinnacle of differential gear engineering for modern brushless RC trucks and monster trucks. Machined from high-grade steel and featuring a sophisticated spiral-cut design with wide tooth profile, this component is engineered to handle the extreme torque output delivered by contemporary brushless motors found in ARRMA's 6S and higher-powered models. The 43-tooth configuration, combined with the 10-tooth spiral-cut input gear in the GP4 system, creates precise gear ratios that optimise power delivery across the entire speed range whilst maintaining mechanical efficiency. The precision manufacturing process ensures that tooth flanks are perfectly profiled to minimise friction, reduce noise and maximise power transmission efficiency — critical factors for competitive RC racing and high-performance bashing. The spiral-cut geometry distributes loads across multiple teeth simultaneously rather than single-tooth engagement, dramatically reducing peak stresses on individual teeth and extending gear life even under the harshest driving conditions. With a bore diameter of 5mm to fit onto standard ARRMA drivetrain shafts and designed for use with 29mm diff case assemblies, this gear integrates seamlessly into the proven ARRMA platform that powers everything from the legendary 1/7 Mojave desert truck to the rapid 1/8 Kraton speed truck and the aggressive 1/8 Notorious stunt truck. This is a genuine, authorised ARRMA component manufactured to the same exacting standards as the complete vehicles.
What's in the Box
- 1 x ARRMA Main Diff Gear 43T Spiral GP4 5mm
What You Need to Complete
- ARRMA Main Input Gear 10T Spiral Cut GP4 5mm (ARA310979) — This mating gear is essential and must be used in conjunction with the 43T main diff gear for proper operation of the differential system.
- ARRMA 29mm Diff Case (ARA310983 or ARA311061) — The main diff gear must be installed into a compatible 29mm diameter diff case housing; either the standard ARA310983 or ARA311061 will work correctly.
Frequently Asked Questions
- What ARRMA models is this 43T main diff gear compatible with? — The ARRMA Main Diff Gear 43T Spiral is listed as a standard fitment on a comprehensive range of ARRMA models including the 1/7 Big Rock 6S, 1/7 Fireteam 6S, 1/7 Mojave 6S in multiple variants, 1/8 Kraton 6S in multiple versions and chassis types, 1/8 Notorious 6S, 1/8 Outcast 6S, 1/8 Talion 6S and their various RTR, EXB and roller configurations. Always verify your specific model number against the compatibility list before ordering.
- Can I use this gear to upgrade my existing ARRMA truck? — Yes, this 43T spiral-cut main diff gear can serve as a replacement for worn gears or as a performance upgrade to OEM gears. However, you must ensure your model is equipped with a 29mm diff case and uses the GP4 input gear system, and you will need to pair this 43T gear with the compatible ARA310979 10T input gear for proper operation.
- What is the advantage of the spiral-cut design compared to standard gears? — Spiral-cut gears have teeth that engage gradually rather than all at once, resulting in smoother, quieter operation with less shock loading on individual teeth. The wide tooth profile distributes forces across a larger contact area, significantly increasing torque handling capability and extending gear life under extreme driving conditions typical of high-performance RC bashing and racing in the UK.
- Why do I need a 29mm diff case with this gear? — The 43T main diff gear is engineered to fit onto a 29mm diameter diff case housing. The diff case provides the bearing surfaces and structure that hold the main diff gear in position within the drivetrain. ARRMA offers two compatible options: the ARA310983 or ARA311061 diff case assemblies.
- Is this gear suitable for beginners? — This is a specialist drivetrain component intended for users with intermediate to advanced RC knowledge. Differential gear installation and maintenance requires mechanical skill, specialised tools and understanding of drivetrain systems. Beginners should consider having their gear installed by an experienced RC technician or purchasing complete pre-assembled drivetrain units.
- How do I know if my diff gear needs replacing? — Signs of a worn or damaged main diff gear include difficulty turning the wheels when the engine is off, grinding or clicking noises during operation, loss of traction, or visible tooth damage when you inspect the gear. Regular inspection during maintenance is recommended, especially for vehicles that are used frequently or subjected to hard bashing.
- What is the difference between the 43T gear and other tooth counts? — The 43-tooth configuration, when paired with a 10-tooth input gear, creates a specific gear ratio that balances torque and top speed. Higher tooth counts generally favour acceleration and climbing, whilst lower counts favour top speed. The 43T is the standard fitment for most ARRMA models and provides an optimal balance for general driving and bashing.
Why Buy from RC Model Shop?
RC Model Shop is a trusted UK RC retailer and authorised dealer for all the brands we stock, including Traxxas, ARRMA, Losi, FTX, Hobbywing, Spektrum and more. Based in Walsall, we have a physical store where customers are welcome to come in, view products and purchase in store. Whether you are a seasoned competitor, a weekend basher, or just discovering the world of RC for the first time, our team of experienced RC enthusiasts is here to help you find the perfect setup and provide ongoing support. Order the ARRMA Main Diff Gear 43T Spiral 29mm Diff Case GP4 5mm Z-ARA310980 today with confidence, knowing you are buying from an authorised retailer with genuine products, expert knowledge and a commitment to customer satisfaction. Shop online or visit us in Walsall — we look forward to helping you get the most out of your RC experience.
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