Traxxas TRX-4 Centre Driveshaft Extension Kit XX-Long Medium Shafts TRX8150

Overview

The Traxxas TRX-4 Centre Driveshaft Extension Kit is an essential upgrade for RC enthusiasts in the UK who are looking to extend the capabilities of their TRX-4 crawler. This specialist drivetrain component is specifically engineered for use with the TRX-4 Long Arm Lift Kit, allowing you to increase your vehicle's wheelbase to 336 mm and unlock new performance potential. Whether you're a seasoned RC crawler competitor or a weekend basher exploring the world of rock crawling, this driveshaft extension kit represents genuine Traxxas engineering that will keep your TRX-4 running smoothly and reliably on the trail.

The TRX-4 platform has become one of the most popular choices for scale RC crawlers in the UK and worldwide, and Traxxas continues to support enthusiasts with comprehensive upgrade and spare parts options. The centre driveshaft extension kit is a purpose-built component that ensures your vehicle maintains optimal drivetrain geometry and performance when running the longer suspension geometry offered by the Long Arm Lift Kit. By carefully matching the driveshaft lengths to your extended wheelbase configuration, you'll achieve better weight distribution, improved traction, and more realistic scale performance on rocks, logs, and challenging terrain.

As an authorised Traxxas retailer, RC Model Shop stocks genuine parts that meet the manufacturer's exacting standards, ensuring perfect compatibility and long-term reliability. This is not a generic aftermarket component—it's factory engineering designed specifically for the TRX-4 platform and tested by Traxxas engineers to deliver the performance you expect.

Key Features

• Two XX-Long Internal-Spline Shafts — The kit includes two extra-long driveshaft sections that are essential for maintaining proper drivetrain geometry when you've extended your TRX-4's wheelbase to 336 mm using the Long Arm Lift Kit, ensuring smooth power delivery and reducing stress on CV joints and bearings.
• One Long Internal-Spline Shaft — This medium-length section provides additional flexibility in your drivetrain configuration, allowing you to dial in the perfect setup for your specific terrain and driving style without compromising performance.
• One Medium Internal-Spline Shaft — The medium-length shaft offers another sizing option in your upgrade toolkit, giving you complete flexibility to achieve the ideal driveshaft configuration for your extended-wheelbase TRX-4 setup.
• Genuine Traxxas Manufacturing — These driveshafts are manufactured to original Traxxas specifications using quality materials and precision engineering, ensuring they integrate seamlessly with your existing TRX-4 drivetrain components and other Traxxas parts.
• Internal-Spline Design — The internal-spline connection system provides a secure, reliable coupling that minimises wobble and maintains precise alignment, which is critical for smooth operation and extended component lifespan on challenging trail conditions.
• Compatible with Long Arm Lift Kit — This kit is specifically engineered as a direct pairing with Traxxas's TRX-4 Long Arm Lift Kit, eliminating guesswork and ensuring perfect fitment without the need for modifications or workarounds.
• Essential Upgrade for Extended Wheelbase Builds — When you increase your TRX-4's wheelbase for improved stability and scale realism, you must upgrade the centre driveshaft accordingly, making this kit a necessary component for anyone running the Long Arm Lift Kit upgrade.

Technical Performance

The Traxxas TRX-4 Centre Driveshaft Extension Kit represents careful engineering for the demands of modern scale RC crawling. When you extend your TRX-4's wheelbase using the Long Arm Lift Kit, the standard driveshafts become too short to provide proper articulation and power delivery without binding or creating excessive angles at the CV joints. This extension kit solves that problem with precision-manufactured shafts that maintain optimal driveline geometry across the full suspension travel range. The internal-spline connection system used throughout ensures smooth, backlash-free power transmission while allowing controlled flex and articulation as you navigate uneven terrain. Traxxas engineers have calibrated the shaft lengths—two XX-long sections, one long section, and one medium section—to provide complete configurability for different wheelbase extensions and personal setup preferences. The quality of materials and manufacturing precision ensures these shafts will withstand the punishment of rock crawling, water crossings, and aggressive bashing without premature wear or failure. By maintaining proper driveshaft angles and lengths, you'll experience improved traction, smoother operation, reduced vibration, and extended lifespan for your entire drivetrain system. This is the kind of engineered detail that separates purpose-built RC crawlers from improvised setups, and it's why serious UK RC enthusiasts trust Traxxas components for their crawler builds.

What's in the Box

• Two XX-Long internal-spline driveshafts
• One Long internal-spline driveshaft
• One Medium internal-spline driveshaft

Frequently Asked Questions

• Is this driveshaft extension kit compatible with my standard TRX-4? — This kit is specifically designed for use with the TRX-4 Long Arm Lift Kit, which extends your wheelbase to 336 mm. If you're running a standard TRX-4 without the Long Arm Lift Kit, you won't need this extension kit. The standard TRX-4 comes with appropriately sized driveshafts from the factory.
• Why do I need to upgrade the centre driveshaft when using the Long Arm Lift Kit? — When you extend your TRX-4's wheelbase using the Long Arm Lift Kit, the stock driveshafts become too short to accommodate the increased distance between the front and rear differentials. Using undersized shafts will cause binding, excessive joint angles, poor power delivery, and potential drivetrain damage. The extension kit ensures proper geometry and reliable operation.
• What's the difference between the XX-Long, Long, and Medium shafts in this kit? — Traxxas provides multiple shaft lengths to give you complete configurability. Different builders may prefer different setups, and having all three options lets you fine-tune your drivetrain geometry for your specific suspension setup, terrain type, and driving style. You'll use the two XX-Long shafts for the primary configuration, but having the Long and Medium options provides flexibility for experimenting.
• Can I use this kit on a TRX-4 without the Long Arm Lift Kit? — No, this extension kit is engineered specifically for TRX-4s running the Long Arm Lift Kit. Using it on a standard-wheelbase TRX-4 will result in improper driveline angles, potential binding, and poor performance. Only use this kit if you have installed the Long Arm Lift Kit.
• Will these driveshafts work with my other Traxxas models? — These shafts are engineered specifically for the TRX-4 platform and feature TRX-4-specific internal-spline dimensions. They will not be compatible with other Traxxas models without modification, and attempting to use them on other platforms may result in poor fitment and drivetrain damage. Always verify compatibility before installation.
• How often will I need to replace these driveshafts? — Genuine Traxxas driveshafts are engineered for durability and will provide years of reliable service with normal maintenance. Replacement frequency depends on your driving style, terrain difficulty, and maintenance habits. Regularly inspect your shafts for wear or damage, and replace them if they show signs of bending, spline wear, or damage to the internal connections.
• Is professional installation required for this kit? — Installation requires basic mechanical skills and familiarity with TRX-4 maintenance. The internal-spline connections are straightforward to install and remove, but if you're not comfortable working on your RC crawler, your local authorised Traxxas dealer or experienced RC shop can install the kit for you.

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 Driveshaft extension kit, centre (includes internal splined, x-Long (2 pcs), internal splined, Long (1pc) and internal splined, Medium (1pc)) (for use with TRX-4 Long Arm Lift Kit) TRX8150 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.