Traxxas Differential, Rear, Complete (fits X-Maxx 8S) TRX7881

Overview

The Traxxas Differential, Rear, Complete (TRX7881) is a Pro Built® rear differential assembly designed specifically for the Traxxas X-Maxx 8S monster truck and XRT vehicle platforms. This is a genuine OEM Traxxas spare part that comes fully assembled and ready to install, making it an essential replacement component for RC enthusiasts who demand reliability and performance from their high-powered 8S brushless RC vehicles. Whether you're a serious competitor, weekend basher, or dedicated X-Maxx owner in the UK, having a quality rear differential on hand ensures your RC car UK experience remains uninterrupted and competitive.

Built to the exacting standards Traxxas is renowned for, this complete rear differential assembly represents the perfect blend of engineering precision and practical durability. The unit arrives fully assembled with all internal components fitted and ready to use, eliminating the need for complicated installation procedures or additional component sourcing. This is particularly valuable for RC enthusiasts who want to get back on the track or field as quickly as possible without worrying about differential tuning or assembly challenges.

If you own an X-Maxx 8S or are running an XRT platform, you'll understand the importance of having genuine Traxxas spare parts available. The rear differential is a critical component in your drivetrain, responsible for distributing power smoothly to the rear wheels whilst allowing them to rotate at different speeds during cornering. A quality, properly functioning rear differential makes an enormous difference in handling characteristics, traction control, and overall driving experience.

Key Features

• Complete Assembled Assembly — This differential arrives fully assembled with all internal components already installed, which means you can fit it straight onto your X-Maxx 8S or XRT without needing to purchase additional parts or spend time assembling internal gears and bearings. This saves time, reduces the risk of installation errors, and gets you back to driving faster.
• Includes Differential Pinion Gear — The pinion gear is a critical component in the differential system that meshes with the crown gear to transfer rotational power through the drivetrain. By including this essential component in the assembly, Traxxas ensures you have everything needed for a complete, functioning rear differential without the expense of purchasing components separately.
• High-Quality Bearings Fitted — The assembly includes precision bearings that enable smooth rotation and minimise friction within the differential housing. Quality bearings are absolutely essential for consistent performance, reduced drag, and extended component lifespan, particularly in the demanding conditions of high-speed 8S brushless RC driving.
• Genuine OEM Traxxas Component — This is an official Traxxas spare part engineered and manufactured to exact factory specifications. Using genuine OEM components ensures perfect compatibility, optimal performance, and warranty protection that aftermarket alternatives simply cannot match.
• Designed for 8S LiPo Power — This rear differential is specifically engineered to handle the extreme power delivery and torque output of 8S LiPo battery systems, which are capable of delivering tremendous acceleration and speed. The internal components and gear ratios are optimised for this voltage and power level, ensuring reliable operation under these demanding conditions.
• Simple Installation — Because the differential comes as a complete, pre-assembled unit, installation is straightforward and requires no specialised differential knowledge. Simply remove the old unit and install the new one following your vehicle's manual, making this an ideal repair for builders of all skill levels.

Technical Performance

The Traxxas Differential, Rear, Complete TRX7881 represents the pinnacle of differential engineering for high-performance 8S RC monster trucks and race vehicles. Built with precision-machined internal components and fitted with premium-quality bearings, this assembly is engineered to withstand the extreme torque and rotational forces generated by brushless motors running on 8S LiPo battery systems. The differential pinion gear is manufactured to exacting tolerances to ensure smooth, quiet operation with minimal backlash, which is essential for consistent handling and predictable traction during aggressive cornering and high-speed runs. The complete assembly design means all components are already matched and installed by Traxxas engineers, eliminating the risk of incompatible parts or improper spacing that can occur with separately sourced components. This level of precision engineering translates directly into improved handling characteristics, more consistent lap times, and longer component lifespan compared to inferior aftermarket alternatives. The bearing quality in particular is crucial, as bearings in the differential must support radial and thrust loads whilst maintaining extremely low friction across the full RPM range of high-speed brushless motors. Whether you're pushing your X-Maxx through mud, sand, grass, or tarmac, or competing in serious racing environments, this differential delivers the durability and performance expected from Traxxas' professional-grade component range.

What's in the Box

• Complete assembled rear differential assembly
• Differential pinion gear (pre-installed)
• Precision bearings (pre-installed)

Frequently Asked Questions

• Is this rear differential compatible with both X-Maxx 8S and XRT vehicles? — Yes, the TRX7881 is designed to fit both the Traxxas X-Maxx 8S monster truck range (including the standard 8S, Ultimate, and Belted variants) and the Traxxas XRT high-performance vehicle platform. This makes it an excellent spare part choice if you run multiple 8S Traxxas vehicles, as a single differential can serve as a backup for either platform.
• Why should I choose a genuine Traxxas differential over aftermarket alternatives? — Genuine Traxxas components are engineered specifically for your vehicle and manufactured to exacting quality standards. This ensures perfect fitment, optimal performance, and warranty protection. Aftermarket differentials may offer lower prices but often compromise on materials, tolerances, and longevity, which can result in poor handling, increased wear on other drivetrain components, and ultimately higher total cost of ownership.
• What does it mean that this differential is Pro Built? — Pro Built indicates that the differential is fully assembled by Traxxas as a complete, ready-to-install unit. This means all internal components including gears and bearings are already installed and tested, eliminating the need for any differential assembly work on your part. This is a massive convenience advantage for most RC enthusiasts.
• How difficult is it to install this differential on my X-Maxx 8S? — Installation is relatively straightforward for anyone with basic RC mechanics knowledge. The differential bolts onto the rear axle housing in place of your existing unit. Full installation instructions are available in your vehicle's manual. If you're uncomfortable working on your RC vehicle, many hobby shops across the UK offer installation services.
• Will this improve my X-Maxx's handling? — If your current differential is worn, damaged, or missing internal components, replacing it with this genuine Traxxas assembly will absolutely improve handling consistency, traction delivery, and cornering performance. A functioning differential is essential for proper vehicle dynamics, and a quality unit like this ensures you're getting the best possible performance from your 8S brushless setup.
• Is this suitable for beginners? — This is a spare part rather than a complete vehicle, so it's best suited to intermediate and advanced RC enthusiasts who already own an X-Maxx 8S or XRT and understand drivetrain maintenance. Beginners would be better served by purchasing a complete ready-to-run RC model rather than individual spare parts.
• What is the difference between this and similar differentials? — This is a genuine Traxxas OEM component engineered specifically for 8S LiPo vehicles with the exact specifications required by X-Maxx and XRT platforms. Third-party differentials may have different internal gear ratios, bearing quality, or material specifications, which can affect performance and compatibility. Using the genuine Traxxas part ensures your vehicle operates exactly as designed by the manufacturer.

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 Differential, Rear, Complete (fits X-Maxx 8S) TRX7881 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.