ARRMA Aluminum Gearbox Set Z-ARA311186

• Model Number: Z-ARA311186 (ARRMA #ARA311186)
• Product Type: Aluminum Gearbox Set (Transmission Component)
• Manufacturer: ARRMA
• Scale: 1/8 Scale
• Construction Material: Aluminium with red anodised finish
• Gearbox Finish: Red anodised for corrosion resistance and durability
• Compatibility: ARRMA 1/8 KRATON 6S 4X4 RTR, KRATON 6S EXB 4X4 RTR, KRATON 6S EXB AVC 4X4 RTR, NOTORIOUS 6S 4X4 RTR (all brushless 6S vehicles)
• Included Components: Aluminum Gearbox Housing, Aluminum Gearbox Cover, Aluminum Gearbox Roll Bar Cover, Gearbox Sealing Gasket
• Bearings: Two precision-machined bearings (5 x 13 x 4mm and 6 x 10 x 3mm)
• Shims: Three shims (8 x 12 x 0.2mm) for gear mesh alignment and preload adjustment
• Fasteners: 2x Flat Head Screw M2 x 6mm, 2x Flat Head Screw M4 x 12mm, 2x Flat Head Screw M4 x 16mm, 4x Cap Head Screw M3 x 12mm, 2x Cap Head Screw M3 x 6mm, 1x Set Screw M3 x 3mm
• Additional Components: 2x Roll Bar Collars, 1x Split Pin 2.5 x 6mm
• Features: Precision machined for accurate fit, aluminium construction for extreme bash strength, red anodised finish for cool looks and corrosion resistance, all hardware included
• Fitment Status: Standard Parts for listed ARRMA models
• EAN Code: 5052127046145
• Customer Rating: 4.1 out of 5 stars
• Availability: In stock with backorder option available

Overview

The ARRMA Aluminum Gearbox Set Z-ARA311186 is an essential replacement and upgrade component for ARRMA 1/8 scale RC vehicles, particularly the KRATON 6S and NOTORIOUS 6S model ranges. Whether you're a serious RC enthusiast looking to maintain your brushless monster truck or stunt truck, or you're upgrading worn components after intense bashing sessions, this precision-engineered gearbox set delivers the durability and performance that ARRMA vehicles are renowned for. As a trusted UK RC retailer, RC Model Shop stocks genuine ARRMA spare parts designed to keep your RC car, truck and off-road vehicle running at peak performance.

This complete gearbox assembly combines premium aluminium construction with meticulous engineering to provide exceptional strength and reliability. The red anodised finish not only looks striking but also provides a protective coating against corrosion and wear. Whether you're replacing a damaged gearbox after a heavy bash session or upgrading from the original components, this set includes every fastener and bearing you need, making installation straightforward for experienced RC hobbyists. The ARRMA Aluminum Gearbox Set represents outstanding value for anyone serious about maintaining their high-performance 1/8 scale brushless RC truck.

Perfect for UK RC enthusiasts who demand reliable, genuine parts for their ARRMA vehicles, this gearbox set is manufactured to ARRMA's exacting standards and is fully compatible with multiple KRATON and NOTORIOUS model variants. The precision machining ensures accurate fit and seamless integration with your existing drivetrain, whilst the robust aluminium construction provides the extreme bash strength that ARRMA vehicles are famous for.

Key Features

• Precision Machined Aluminium Construction — Each component is precision machined from high-quality aluminium to deliver accurate fit and perfect alignment with your ARRMA vehicle's existing drivetrain. This level of manufacturing precision ensures smooth operation and eliminates the rattles and binding that can occur with poorly fitted components, ultimately extending the service life of your entire transmission system.
• Red Anodised Finish — The distinctive red anodised coating not only gives your RC truck a striking, professional appearance but also provides essential protection against corrosion, oxidation and general wear from dirt, moisture and impact. This protective layer is particularly valuable if you regularly bash your RC vehicle in challenging outdoor conditions across the UK.
• Extreme Bash Strength — ARRMA's reputation for building durable RC vehicles is built on materials and engineering that can withstand intense bashing. The aluminium gearbox provides significantly greater strength and impact resistance compared to plastic alternatives, meaning your transmission can handle the punishment of high-speed runs, jumps and rough terrain without failure.
• Complete Hardware Package — Rather than having to source fasteners and components separately, this set includes every screw, bearing, shim, gasket and collar needed for complete reassembly. This comprehensive approach saves time, ensures compatibility of all components, and means you can complete repairs and upgrades without additional shopping.
• Integrated Sealing System — The included gearbox sealing gasket and roll bar cover work together to keep dirt, mud and water out of your transmission, protecting internal components and maintaining smooth operation even in wet or muddy conditions common in UK bashing locations.
• Multiple Bearing Support — The inclusion of two precision bearings (5 x 13 x 4mm and 6 x 10 x 3mm) ensures smooth, wobble-free rotation of the gearbox shafts under load, reducing friction and heat generation whilst extending component lifespan significantly.

Technical Performance

The ARRMA Aluminum Gearbox Set Z-ARA311186 represents a significant upgrade in durability and reliability for 1/8 scale brushless RC vehicles. Constructed from premium aluminium throughout, this gearbox assembly delivers the extreme bash strength ARRMA vehicles are renowned for, making it ideal for serious UK RC enthusiasts who regularly push their trucks to the limit. The precision-machined components ensure tight tolerances and smooth engagement, critical for transmitting the full power output of modern brushless motors whilst maintaining efficiency and minimising power loss. The complete bearing and shimming system provides proper support and alignment throughout the transmission, allowing the gearbox to handle the torque loads generated by 6S LiPo-powered brushless systems without binding or failure. The red anodised finish provides more than just visual appeal—it protects the aluminium from oxidation and corrosion, particularly important for RC vehicles regularly used in wet UK conditions. With all fasteners, gaskets and sealing components included, this is a fully self-contained transmission upgrade that eliminates compatibility issues and ensures every component works together seamlessly.

What's in the Box

• 1 x Aluminum Gearbox (main transmission housing)
• 1 x Aluminum Gearbox Cover
• 1 x Aluminum Gearbox Roll Bar Cover
• 1 x Gearbox Sealing Gasket
• 1 x 5 x 13 x 4mm Bearing
• 1 x 6 x 10 x 3mm Bearing
• 3 x Shim 8 x 12 x 0.2mm (for proper alignment and gear mesh)
• 2 x Roll Bar Collars
• 1 x Split Pin 2.5 x 6mm
• 2 x Flat Head Screw M2 x 6mm
• 2 x Flat Head Screw M4 x 12mm
• 2 x Flat Head Screw M4 x 16mm
• 4 x Cap Head Screw M3 x 12mm
• 2 x Cap Head Screw M3 x 6mm
• 1 x Set Screw M3 x 3mm

Compatible ARRMA Models

The ARRMA Aluminum Gearbox Set Z-ARA311186 is designed as a direct replacement and upgrade component for the following ARRMA 1/8 scale 6S brushless vehicles:

• ARRMA 1/8 KRATON 6S V6 4X4 RTR Brushless Speed Monster Truck (all colour variants)
• ARRMA 1/8 KRATON 6S EXB 4X4 RTR Brushless Speed Truck
• ARRMA 1/8 KRATON 6S EXB AVC 4X4 RTR Brushless Speed Truck
• ARRMA 1/8 NOTORIOUS 6S V6 4X4 RTR Brushless Stunt Truck (all colour variants)

If you own any of these 1/8 scale ARRMA ready-to-run models, this gearbox set will provide either a genuine replacement for a worn or damaged transmission, or a performance upgrade to enhance durability and strength.

Installation and Maintenance

Installing the ARRMA Aluminum Gearbox Set requires intermediate mechanical knowledge and basic RC tools including hex keys, screwdrivers and a torque wrench if available. The included shims should be used to ensure proper gear mesh spacing, which is critical for smooth operation and longevity. After installation, run your RC vehicle at reduced throttle for several minutes to allow the gearbox to bed in properly before conducting full-power runs. Regular maintenance involves checking fasteners for tightness after each use, keeping the gearbox clean and free of debris, and occasionally inspecting the sealing gasket for wear. With proper care, this aluminium gearbox will provide many seasons of reliable service, even under the demanding conditions of competitive bashing and racing.

Frequently Asked Questions

• Is the ARRMA Aluminum Gearbox Set suitable for beginners? — This is an intermediate to advanced component replacement rather than a beginner-friendly part. Installation requires mechanical knowledge, proper tools, and understanding of gear mesh and bearing preload. However, if your ARRMA vehicle requires gearbox replacement, this is the correct genuine part to use. Beginners should consider seeking help from an experienced RC technician or visiting an RC hobby shop if unsure about installation.
• What ARRMA vehicles does this gearbox fit? — The Z-ARA311186 is specifically designed for 1/8 scale ARRMA KRATON 6S and NOTORIOUS 6S models. It is listed as standard parts for the KRATON 6S V6, KRATON 6S EXB, KRATON 6S EXB AVC, and NOTORIOUS 6S vehicles. Check your vehicle documentation to confirm compatibility before purchasing.
• Will this improve the performance of my ARRMA truck? — If you're replacing a damaged or worn plastic gearbox with this aluminium version, you'll experience improved durability and strength. The precision machining ensures smooth operation, and the aluminium construction provides superior impact resistance for heavy bashing. However, this is primarily a durability upgrade rather than a power or speed upgrade—your top speed will be largely determined by your motor and ESC system.
• What tools do I need to install this gearbox? — You'll need hex keys (Allen keys) to fit the cap head and flat head screws, a Phillips screwdriver for any Phillips screws, and potentially a small screwdriver for the set screw. A torque wrench is beneficial to ensure fasteners are tightened correctly without over-tightening, which could strip aluminium threads. A gasket scraper and degreaser are useful for removing old sealing material.
• Does this come fully assembled? — The gearbox housing and cover are separate components that you'll need to assemble together using the included fasteners, bearings, shims and gasket. This allows you to inspect internal components, ensure proper bearing seating, and adjust shimming as needed for optimal gear mesh.
• How long does installation typically take? — For experienced RC technicians, installation should take 30-60 minutes. Beginners may require 90 minutes to 2 hours, especially if taking time to understand proper shimming and fastener tightness. Taking your time during installation is far better than rushing and causing damage.
• Can I use this with a different brand of motor or ESC? — The gearbox itself is brand-agnostic and will work with any compatible ARRMA drivetrain setup. However, you should ensure your motor and ESC are rated for the same power system (6S LiPo) as your vehicle to avoid compatibility issues.
• Is this a complete gearbox replacement or just the housing? — This is a complete gearbox assembly including the aluminium housing, cover, bearings, gasket, seals, and all fasteners needed for complete installation. You are receiving everything necessary for a full transmission replacement or upgrade.

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 Aluminum Gearbox Set Z-ARA311186 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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