ARRMA Composite Front Rear Upper Gearbox Covers Shock Tower AR320399

• Manufacturer: ARRMA
• Model Number: AR320399
• Part Type: Chassis - Gearbox Covers and Shock Tower
• Material: Tough composite
• Contents: 1 x Front Gearbox Upper Cover, 1 x Rear Gearbox Upper Cover
• Features: Integrated gearbox cover, shock tower, body post mount, upper inner suspension mount and steering brace
• Construction: Precision manufactured for consistent fit and easy servicing
• Compatibility: ARRMA Big Rock 3S 4x4, Granite 3S 4x4, Granite 4x4, Granite Boost 2WD, Kraton 4S 4x4, Outcast 4S 4x4, Senton 3S 4x4, Senton 4x4, Senton Boost 2WD, Typhon 3S 4x4, and Typhon 4x4 (1/10 and 1/8 scale models)

Overview

The ARRMA Composite Front Rear Upper Gearbox Covers and Shock Tower (Z-AR320399) are essential replacement chassis parts designed for RC enthusiasts across the UK who demand high-quality spare components for their ARRMA vehicles. Whether you're running a brushless RC monster truck, a short course truck, a speed truck, a stunt truck, or a competition buggy, these gearbox covers and shock tower assemblies provide the durability and precision fit you need to keep your RC car in peak condition. These parts are not just cosmetic upgrades—they form an integral part of your vehicle's structural integrity, protecting critical components whilst maintaining the exact tolerances your ARRMA chassis demands.

If you own any ARRMA 1/10 or 1/8 scale RTR vehicle—whether it's a Big Rock, Granite, Kraton, Outcast, Senton, or Typhon model—you'll find these composite covers are the ideal replacement when your original parts become damaged from crashes, wear, or intensive bashing. For anyone serious about maintaining their ready-to-run RC car or keeping a spare set on hand for race day, these ARRMA parts represent genuine OEM (original equipment manufacturer) components that guarantee perfect fitment and functionality. They're precision-engineered replacements that deliver the same quality as the parts supplied with your kit, making them an essential addition to any RC hobbyist's spares collection.

RC Model Shop stocks genuine ARRMA spare parts for all the most popular brushless and brushed RC trucks and buggies available in the UK market today. Whether you're a weekend basher enjoying outdoor RC action or a serious competitor preparing for events, keeping quality replacement parts in stock ensures minimal downtime and maximum fun behind the transmitter.

Key Features

• Tough Composite Material Construction — These gearbox covers and shock tower are manufactured from durable composite materials that provide long-lasting durability, resisting impacts and stress during intense off-road RC driving whilst remaining lightweight compared to metal alternatives, which helps maintain optimal vehicle balance and handling characteristics.
• Precision Manufacturing for Consistent Fit — Every component is precision-manufactured to exact tolerances, ensuring a perfect fit with your ARRMA chassis and easy servicing when you need to access the gearbox or shock components without any gaps, misalignments, or compatibility issues.
• Integrated Multi-Function Design — Rather than being simple covers, these parts integrate the gearbox cover, shock tower, body post mount, upper inner suspension mount and steering brace into one intelligent assembly, providing structural support across multiple critical areas of your RC vehicle's chassis.
• Front and Rear Set Included — This package includes both the front gearbox upper cover and rear gearbox upper cover, so you can refresh or repair both ends of your vehicle's chassis with a single purchase.
• Genuine OEM ARRMA Parts — These are authentic ARRMA replacement components (not aftermarket reproductions), guaranteeing the exact same quality, fit, and performance as the parts supplied with your original kit or vehicle.
• Easy Servicing and Maintenance — The precision design ensures that accessing your gearbox for regular maintenance, lubrication, or component replacement is straightforward and hassle-free, keeping your RC car performing optimally throughout the season.

Technical Performance

The ARRMA Composite Front Rear Upper Gearbox Covers and Shock Tower represent the engineering standard you'd expect from ARRMA, the premium RC brand trusted by bashers and racers throughout the United Kingdom and globally. These chassis components are crafted from tough composite materials engineered to withstand the punishment of high-speed driving, jumps, crashes, and aggressive off-road conditions typical of 1/10 and 1/8 scale RC vehicles. The composite construction provides an excellent balance between weight savings and structural rigidity—critical for maintaining the suspension geometry and handling characteristics of your ARRMA vehicle. Unlike heavier metal alternatives, the composite material absorbs vibration and minor impacts whilst maintaining dimensional stability, ensuring your RC truck or buggy maintains consistent performance lap after lap. The shock tower integration is particularly important, as this component directly affects suspension travel, ride height, and the overall geometry of your vehicle's suspension system. By combining the gearbox cover, shock tower, body post mount, upper inner suspension mount and steering brace into a single precision-engineered assembly, ARRMA has created a component that provides structural support whilst simplifying chassis design and reducing the number of individual parts you need to manage. These parts are compatible with multiple ARRMA models including the Big Rock 3S, Granite 3S, Granite 4x4, Granite Boost, Kraton 4S, Outcast 4S, Senton 3S, Senton 4x4, Senton Boost, and Typhon 3S and 4x4 in both brushless and brushed variants, making them versatile spares for the ARRMA fleet.

What's in the Box

• 1 x Front Gearbox Upper Cover
• 1 x Rear Gearbox Upper Cover

Frequently Asked Questions

• Which ARRMA models are these gearbox covers compatible with? — These composite covers and shock tower are standard parts for a wide range of ARRMA 1/10 and 1/8 scale vehicles including the Big Rock 3S, Granite 3S, Granite 4x4, Granite Boost 2WD, Kraton 4S, Outcast 4S, Senton 3S, Senton 4x4, Senton Boost 2WD, and Typhon 3S and 4x4 models. Check your vehicle's documentation to confirm fitment or contact RC Model Shop for expert advice on compatibility with your specific ARRMA RC truck or buggy.
• Why would I need replacement gearbox covers? — During normal bashing and racing, gearbox covers and shock towers can become cracked, scratched, or damaged from impacts and crashes. Replacement covers maintain the structural integrity of your chassis, protect internal gearbox components from dirt and moisture, and ensure your vehicle maintains the correct suspension geometry and handling characteristics. Having spare covers on hand minimises downtime when damage occurs.
• Are these genuine ARRMA parts or aftermarket replacements? — These are genuine OEM (original equipment manufacturer) ARRMA parts, identical to those supplied with new ARRMA kits and vehicles. Choosing genuine ARRMA spares ensures perfect fitment, verified quality, and performance consistency with your existing chassis, unlike cheaper aftermarket alternatives that may have poor tolerances or incompatibility issues.
• How difficult is it to install these gearbox covers? — Installation is straightforward for anyone with basic RC maintenance experience. The precision manufacturing ensures that these components fit perfectly with minimal adjustment required. Simply remove your old covers (which typically involves unbolting several fasteners) and install the new ones, securing them with the same mounting points. The integrated design means you're not fiddling with dozens of separate components—installation time is typically 15-30 minutes depending on your familiarity with your ARRMA vehicle's chassis.
• Do I need any special tools to fit these components? — Standard RC tools are all you'll need: a set of metric hex keys (typically 1.5mm, 2.0mm, and 2.5mm), possibly a small Phillips or flathead screwdriver, and potentially a small wrench for certain fasteners depending on your specific ARRMA model. No specialist tools or expertise is required.
• What material are these covers made from? — These gearbox covers and shock tower are manufactured from tough composite material, which offers an excellent balance of lightweight construction, impact resistance, and durability. Composite materials provide superior vibration damping compared to metal, helping maintain suspension geometry and handling consistency during intense driving.
• Can I use these as upgrades on an older ARRMA vehicle? — These covers are designed as replacement parts for the models listed. If you own an older ARRMA vehicle not listed in the compatibility chart, contact RC Model Shop to verify whether these components will work with your specific model, as chassis designs and mounting points can vary between generations.

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 Composite Front Rear Upper Gearbox Covers and Shock Tower Z-AR320399 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.

We want to make sure your delivery goes smoothly, so here are some important details about our service:

• For orders above £120, we offer delivery to most mainland UK addresses. For orders under £120, we can still deliver to Northern Ireland and the outlying isles, as long as the item can be sent by Royal Mail, weighs less than 30kg, and fits within 61cm × 46cm × 46cm. Some highland and remote areas may carry an extra delivery charge as couriers often apply surcharges in these locations. If you live in one of these areas, feel free to contact us before ordering so we can confirm the delivery options and costs for you.
• Most of our products include delivery in the price. If your order is under £90, a small delivery fee will apply but do not worry this will always be clearly shown at checkout before you complete your purchase.
• Depending on what you choose at checkout, your order will usually be delivered either the next working day or within 2 working days. For next day delivery please place your order before 2:00pm. Orders are dispatched Monday to Friday only. Some items may take a little longer and if that is the case we will always show the expected delivery time on the product page.
• If your order includes items with different dispatch times we will normally wait and send everything together once all items are in stock. If one of the items is going to take a while we will give you the choice either wait for everything to arrive or let us send the available items now and deliver the rest later. It is up to you.
• We use trusted delivery partners to make sure your order gets to you safely and on time. We use DPD for next working day deliveries and Royal Mail for the 2 day option.
• As soon as your order is on its way we will send you a tracking number by email. If you provide your mobile number at checkout we will also send delivery updates straight to your phone so you can keep an eye on progress.
• If a product is marked as "Dispatched within 3 working days" delivery usually takes around 3 to 5 working days from when your order is placed.
• For customers in Inverness and other parts of the Scottish Highlands deliveries can take up to 2 working days even if you select next day delivery as couriers do not currently offer a guaranteed next day service to those areas.