Overview
The ARRMA Diff Shim Set is an essential maintenance and tuning component for owners of ARRMA RC models equipped with 29mm differential cases. Whether you're running a 1/8 scale brushless RC monster truck, speed truck, or stunt truck, this comprehensive shim kit provides you with the full range of shims needed to correctly adjust and service your differentials. Differential shimming is a critical aspect of RC car tuning that directly affects handling, traction control, and overall performance on track or at the bash spot. This genuine ARRMA spare part gives you the flexibility to convert between limited-slip differential (LSD) setups and open differentials, or simply maintain proper differential preload across multiple vehicles.
Designed for precision and durability, the ARRMA Diff Shim Set is manufactured to exacting standards and constructed from hardened steel for long-lasting performance in all conditions. The kit includes enough shims for three complete differentials, making it an excellent investment for serious RC enthusiasts who run multiple vehicles or regularly maintain their fleet. Whether you're a competitive racer looking to fine-tune your differential setup, a weekend basher who wants to keep spares on hand, or an RC hobbyist in the UK discovering the importance of differential maintenance, this shim set provides the professional-grade components you need to get the best out of your ARRMA RC car.
Proper differential shimming affects how power is distributed between the wheels, which has a significant impact on cornering ability, acceleration, and overall drivability. With this complete shim set, you can experiment with different configurations to find the setup that works best for your driving style and terrain. The precision-manufactured shims ensure consistent fit and hassle-free servicing every time, eliminating the frustration of poorly fitting replacement parts.
Key Features
- Complete Shim Range — This set includes smaller shims (6.2 x 11.9 x 0.3mm), larger shims (6.3 x 15.7 x 0.2mm), and open differential spacers (12.0 x 17.5 x 1.9mm), giving you all the components needed to correctly shim 29mm differential cases with absolute precision.
- Hardened Steel Construction — Made from strong and durable steel, these shims deliver long-lasting performance in all conditions, whether you're racing on groomed tracks, bashing in mud, or running at high speed on tarmac. Steel construction ensures shims maintain their shape and thickness through countless hours of use.
- Precision Manufactured — Each shim is manufactured to tight tolerances, ensuring consistent fit and hassle-free servicing. This precision engineering means shims slide smoothly into place without binding or rattling, and differential assembly becomes quick and straightforward.
- Three Complete Sets — Provided with three pairs of each size shim, this kit supplies enough components to service three complete differentials. This makes it perfect for owners of multiple ARRMA RC vehicles or those who like to maintain backup differentials for maximum track time and minimal downtime.
- Genuine ARRMA Part — This is an official ARRMA spare part (ARA311094), ensuring 100% compatibility with your ARRMA RC car and confidence in quality and fitment. Using genuine parts means you get components engineered specifically for your vehicle.
- Versatile Configuration Options — With a range of shim thicknesses, you can fine-tune differential preload to match your driving style, terrain conditions, and vehicle setup. Adjust from locked differentials to open differentials and everything in between.
Technical Performance
Differential shimming is a sophisticated aspect of RC car tuning that requires precision-engineered components. The ARRMA Diff Shim Set provides three distinct shim types, each with specific dimensions that allow fine control over differential behaviour. The smaller shims (6.2mm inner diameter, 11.9mm outer diameter, 0.3mm thickness) are used for fine adjustments to differential preload and lockup characteristics. The larger shims (6.3mm inner diameter, 15.7mm outer diameter, 0.2mm thickness) provide additional shimming options for different differential configurations. The open differential spacers (12.0mm inner diameter, 17.5mm outer diameter, 1.9mm thickness) are essential components when converting a limited-slip differential to a fully open setup or when rebuilding differentials from scratch. The hardened steel material ensures these shims resist deformation under the substantial forces generated by acceleration and cornering. With six shims of each size included (totalling 18 individual shims plus spacers), you have ample stock to service multiple differentials and experiment with different preload settings to optimise your RC car's handling and traction characteristics. Proper shimming maintains tight tolerances within the 29mm differential case, which is critical for ensuring smooth operation, minimal backlash, and optimal power distribution to your drive wheels.
What's in the Box
- 6 x Smaller Shims: 6.2mm x 11.9mm x 0.3mm
- 6 x Larger Shims: 6.3mm x 15.7mm x 0.2mm
- 6 x Open Differential Spacers: 12.0mm x 17.5mm x 1.9mm
Compatible ARRMA Models
The ARRMA Diff Shim Set (Fits 29mm Diff Case) is designed to fit the following ARRMA RC vehicles: 1/7 BIG ROCK 6S 4X4 RTR Brushless Monster Truck, 1/7 LIMITLESS 120 8S AVC 4X4 RTR Speed Machine, 1/7 MOJAVE 6S EXB 4X4 Roller Brushless Desert Truck, 1/8 KRATON 6S 4X4 Roller Brushless Speed Truck, 1/8 KRATON 6S 4X4 RTR Brushless Speed Truck, 1/8 KRATON 6S EXB 4X4 RTR Brushless Speed Truck, 1/8 KRATON 6S EXB AVC 4X4 RTR Brushless Speed Truck, 1/8 NOTORIOUS 6S 4X4 RTR Brushless Stunt Truck, 1/8 OUTCAST 6S EXB AVC 4X4 RTR Brushless Stunt Truck, and 1/8 TALION 6S EXB AVC 4X4 RTR Brushless Speed Truck. If you own any of these brushless RC monster trucks, speed trucks, or stunt trucks, this shim set will be a valuable addition to your maintenance kit.
Frequently Asked Questions
- What is differential shimming and why do I need to shim my RC car's differential? — Differential shimming is the process of adjusting the internal clearances and preload within your RC car's differential using precision-engineered shims. Proper shimming controls how much the differential gears can move and determines whether your differential operates as a locked differential (both wheels turn at the same speed), a limited-slip differential (some slipping allowed), or an open differential (wheels can spin independently). The correct shim setup directly affects your RC car's traction, cornering ability, and how power is distributed to the wheels, making it essential for both competitive performance and optimal handling characteristics.
- Is this suitable for beginners? — Differential shimming is an intermediate to advanced maintenance task that requires some mechanical knowledge and attention to detail. If you're new to RC car maintenance, you may want to learn about differential servicing from experienced RC enthusiasts, YouTube tutorials, or your local RC club before attempting your first shimming job. However, having this genuine ARRMA shim set on hand is a smart investment once you're ready to take control of your vehicle's differential setup, and the comprehensive range of shims makes experimentation and learning much more practical.
- How many differentials can I service with this kit? — This shim set includes three pairs of each size shim, providing enough components to service three complete 29mm differentials. If you own multiple ARRMA vehicles with 29mm diff cases, this single kit can maintain all of them, making it an economical choice for RC enthusiasts with multiple brushless RC trucks or cars.
- Can I use these shims to convert my limited-slip differential to an open differential? — Yes, one of the key applications of this shim set is converting between differential types. The open differential spacers included in this kit are specifically designed for open differential configurations. By using the appropriate combination of shims and spacers, you can easily reconfigure your differential to suit your driving style and track conditions.
- Are these genuine ARRMA parts? — Yes, the ARRMA Diff Shim Set is an official ARRMA spare part (ARA311094) manufactured to exact specifications. Genuine ARRMA parts ensure perfect compatibility with your vehicle and confidence in quality, durability, and fitment.
- What makes these shims different from aftermarket alternatives? — These are genuine ARRMA parts engineered specifically for ARRMA's 29mm differential cases. They feature precision manufacturing with tight tolerances, hardened steel construction, and are backed by ARRMA's quality standards. Genuine parts also ensure hassle-free servicing and consistent performance, whereas cheaper aftermarket shims may have inconsistent dimensions that can lead to fit issues and differential problems.
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 Diff Shim Set (Fits 29mm Diff Case) (3 Diffs) Z-ARA311094 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.
