Overview
The Traxxas Bulkhead, Rear (upper & lower), motor mount washers (steel) (4), 4x18mm BCS (4) TRX7727A is an essential replacement chassis component for owners of the legendary Traxxas X-Maxx series of 1/5 scale brushless RC monster trucks. This genuine Traxxas spare part is engineered to restore your vehicle's structural integrity and performance, whether you're a weekend basher exploring challenging terrain or a dedicated RC enthusiast pushing your monster truck to its limits on UK tracks and trails. The rear bulkhead assembly is a critical structural element that houses the motor mount and maintains the chassis geometry essential for handling, power delivery and overall vehicle stability.
If you've experienced damage to your X-Maxx's rear chassis assembly through hard impacts, jumps or general wear and tear, this comprehensive replacement kit provides everything needed to get your truck back in action. The inclusion of premium steel motor mount washers and high-quality ball cage screws ensures durable, secure fastening that can withstand the tremendous forces generated by brushless power in extreme RC motorsport environments. As an authorised Traxxas retailer serving the UK RC community, RC Model Shop stocks genuine OEM parts like the TRX7727A to keep your investment performing at peak levels.
This replacement rear bulkhead assembly is compatible with multiple X-Maxx variants including the X-Maxx Ultimate and X-Maxx Belted 4WD Brushless RTR 8S Monster Truck in various colours. Whether you're rebuilding after an accident or undertaking preventative maintenance, this Traxxas spare part represents the reliable, factory-correct solution for serious RC enthusiasts in the UK.
Key Features
- Complete Rear Bulkhead Assembly — Includes both upper and lower bulkhead halves manufactured to exact Traxxas specifications, providing the rigid chassis structure needed to maintain vehicle geometry and handling characteristics on your 1/5 scale monster truck.
- Four Steel Motor Mount Washers — Premium steel washers are included to secure the motor mount safely and distribute loads evenly, preventing fastener loosening and protecting your brushless motor investment during aggressive driving and high-powered RC motorsport.
- Ball Cage Screws (BCS) 4x18mm — These precision-engineered 4x18mm ball cage screws provide secure fastening of critical chassis components with minimal play, ensuring reliable performance and quick assembly when rebuilding your X-Maxx.
- OEM Traxxas Genuine Part — As an official Traxxas replacement component, this bulkhead assembly is manufactured to factory standards with exact dimensional accuracy, ensuring perfect fitment and long-term reliability.
- Replaces Superseded Parts — This component replaces the earlier Traxxas parts #7727 and #7728, offering improved design and durability for the latest X-Maxx generation vehicles.
- Compatible with X-Maxx Range — Designed specifically for the Traxxas X-Maxx Belted 4WD Brushless RTR 8S Monster Truck and X-Maxx Ultimate variants, ensuring seamless integration with your existing setup.
- Ball Bearing Ready — The kit requires two #5107A or #5108 ball bearings (not included) for complete installation, allowing you to specify premium bearing options for your specific performance requirements.
Technical Performance
The Traxxas rear bulkhead assembly represents the pinnacle of chassis engineering for 1/5 scale RC monster trucks, constructed from durable materials engineered to withstand the immense stresses generated by brushless power and aggressive driving techniques. The upper and lower bulkhead halves work together to create a rigid structural framework that maintains chassis alignment under extreme acceleration, deceleration and cornering forces. The inclusion of four premium steel motor mount washers ensures that your brushless motor remains securely fastened, distributing the mechanical loads evenly and preventing the fastener creep that can occur during sustained high-powered operation. The 4x18mm ball cage screws provide smooth fastening action with minimal resistance, allowing you to quickly disassemble and service your vehicle without damaging critical components. This replacement bulkhead assembly is designed for the full spectrum of X-Maxx driving scenarios, from speed runs across open ground to technical rock crawling and everything in between. The engineering tolerances are precise enough to work seamlessly with the rest of your Traxxas chassis, and the materials are selected for longevity and resistance to the wear and tear inherent in serious RC motorsport. Whether you're running on UK tracks, trails, or backyard courses, this genuine Traxxas spare part will restore your monster truck's structural integrity and performance characteristics.
What's in the Box
- Bulkhead, rear upper half
- Bulkhead, rear lower half
- Motor mount washers (steel) — 4 pieces
- Ball cage screws 4x18mm (BCS) — 4 pieces
What You Need to Complete
- Ball bearings #5107A or #5108 — 2 pieces (required for installation but not included in this kit)
Frequently Asked Questions
- Which Traxxas X-Maxx models is this rear bulkhead compatible with? — This TRX7727A bulkhead assembly is compatible with the Traxxas X-Maxx Ultimate in blue and green variants, as well as the X-Maxx Belted 4WD Brushless RTR 8S Monster Truck available in orange, blue, red and green colours. It is also suitable for the X-Monster Chassis WB model. Always verify your specific model number before ordering to ensure perfect compatibility.
- What do I need to do to install this bulkhead assembly on my X-Maxx? — Installation requires the two ball bearings (#5107A or #5108) that are not included in this kit. You will need to transfer your motor mount and other components from your old bulkhead to the new assembly, using the four supplied steel motor mount washers and the four 4x18mm ball cage screws to secure everything in place. We recommend consulting the official Traxxas X-Maxx assembly guide or seeking assistance from experienced RC technicians if you're unfamiliar with chassis assembly.
- Are these genuine Traxxas parts or aftermarket alternatives? — This is a genuine OEM Traxxas replacement part manufactured to factory specifications. Traxxas genuine spare parts ensure perfect fitment, reliable performance and compatibility with all factory components on your vehicle. Choosing genuine parts protects your investment and maintains the performance characteristics your truck was designed to deliver.
- Why does the kit require ball bearings separately if they're critical to installation? — The ball bearings are listed as required components that must be ordered separately (part numbers #5107A or #5108) because this allows you to choose your bearing specification based on your performance requirements and driving style. Some enthusiasts prefer specific bearing qualities for different conditions, and separating them gives you that flexibility.
- Can I use this bulkhead on other Traxxas models besides the X-Maxx? — No, this rear bulkhead assembly is specifically engineered for the X-Maxx series of 1/5 scale monster trucks. Using it on other Traxxas models will result in fitment issues and potential performance problems. Always verify compatibility with your specific model before ordering any chassis components.
- Is this suitable for beginners? — This is a replacement spare part intended for owners who already have an X-Maxx and are experienced with basic vehicle maintenance and assembly. Installation requires mechanical knowledge and proper tools. If you're new to RC and need guidance, we recommend visiting RC Model Shop in Walsall or contacting our team of experienced RC enthusiasts who can provide step-by-step assistance.
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 Traxxas Bulkhead, Rear (upper & lower), motor mount washers (steel) (4), 4x18mm BCS (4) (replacing #7727 & #7728 requires #5108 ball bearings (2)) TRX7727A 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.
- Product Type: Rear bulkhead assembly (upper and lower halves)
- Manufacturer: Traxxas
- Model Number: TRX7727A
- EAN Code: 020334000514
- Spare Part Category: Chassis spares
- Compatible Vehicles: Traxxas X-Maxx Ultimate (Blue X and Green X), Traxxas X-Maxx Belted 4WD Brushless RTR 8S Monster Truck (Orange, Blue, Red, Green), Traxxas X-Monster Chassis WB
- Components Included: Rear upper bulkhead half, Rear lower bulkhead half, Motor mount washers (steel) — 4 pieces, Ball cage screws 4x18mm — 4 pieces
- Additional Components Required: Ball bearings #5107A or #5108 — 2 pieces (not included)
- Material: Steel (motor mount washers)
- Fastener Type: 4x18mm ball cage screws (BCS)
- Replaces: Traxxas parts #7727 and #7728
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.
