Traxxas Gearbox Halves Left Right with Idler Gear Shaft Black TRX3691

Overview

The Traxxas Gearbox halves (left & right) (Black) with idler gear shaft TRX3691 is an essential drivetrain spare part designed for RC enthusiasts across the UK who demand reliability and durability in their models. Whether you're a weekend basher pushing your RC short course truck to its limits or a dedicated hobbyist maintaining your fleet, this genuine Traxxas component ensures your vehicle's transmission system operates smoothly and efficiently. These precision-engineered gearbox halves are specifically engineered to deliver consistent performance and longevity, making them an indispensable part of any RC car UK owner's spare parts collection.

As a dedicated spare part for Traxxas RC vehicles, this gearbox assembly represents the manufacturer's commitment to quality engineering and dependable performance. The inclusion of both left and right halves along with the idler gear shaft means you receive everything needed for a complete gearbox rebuild or replacement, eliminating the need to source multiple components from different suppliers. For those serious about maintaining their RC models in peak condition, investing in genuine Traxxas spare parts like these gearbox halves ensures your vehicle continues to deliver the speed, reliability and precision handling that Traxxas is renowned for.

This component is particularly popular among owners of the Traxxas Slash HD XL-5 short course truck range, one of the most successful ready to run RC vehicles available to UK buyers. The Slash platform has earned a reputation as a tough, dependable workhorse capable of handling both on-road and light off-road conditions, and these gearbox halves play a crucial role in maintaining that legendary durability. Whether you're replacing worn components after extended use or building a backup vehicle for competition, the TRX3691 gearbox halves deliver the authentic Traxxas quality and precision you expect.

Key Features

• Complete Left and Right Gearbox Halves — This spare includes both the left and right halves of the gearbox assembly, ensuring you have all the components needed for a full gearbox rebuild without having to purchase parts separately from different suppliers, saving you time and money on your RC maintenance.
• Integrated Idler Gear Shaft — The inclusion of the idler gear shaft with these gearbox halves means the entire gearbox assembly is supplied as one complete unit, reducing the complexity of installation and ensuring proper alignment and fitment of all drivetrain components.
• Black Finish — The durable black colour finish not only provides excellent aesthetic appeal but also helps disguise dirt and wear, maintaining the appearance of your RC model between maintenance sessions whilst showing off the professional engineering inside.
• Genuine Traxxas Manufacturing — As an official Traxxas spare part, these gearbox halves are manufactured to the exact same specifications and quality standards as the originals, guaranteeing perfect fitment, reliable performance and long-term durability in your RC vehicle.
• Drivetrain-Critical Component — The gearbox halves form the structural backbone of your vehicle's transmission system, housing the gears and shafts that transmit power from the motor to the wheels, making them fundamental to your RC car's acceleration, top speed and overall driving experience.
• Compatible with Multiple Slash HD Variants — These gearbox halves are designed to fit seamlessly with several versions of the Traxxas Slash HD XL-5 short course truck, including the blue, orange, green and red RTR editions, offering versatility across the popular Slash HD lineup.
• Easy Installation — As a precision component from Traxxas, these gearbox halves are engineered for straightforward replacement, allowing experienced RC enthusiasts to perform maintenance and repairs quickly without requiring specialist tools or extensive mechanical knowledge.

Technical Performance

The Traxxas Gearbox halves TRX3691 represent precision engineering at its finest, crafted to withstand the rigorous demands of RC driving. These components form the heart of the transmission system in the Traxxas Slash HD XL-5 short course truck, a vehicle capable of impressive speeds and sustained performance across varied terrain. The gearbox assembly houses a series of precisely machined gears and the idler gear shaft, which work together to deliver smooth power transmission from the brushless or brushed motor through to the wheels. The engineering tolerances are extremely tight, ensuring minimal backlash and maximum efficiency in power delivery, which translates directly to responsive handling and consistent acceleration from a standstill. The black finish applied to these gearbox halves is more than cosmetic; it protects the aluminium and composite materials from the elements whilst allowing heat dissipation during extended running sessions. The structural integrity of these halves is critical, as they must withstand the torque forces generated during acceleration, cornering and braking, making material quality and manufacturing precision non-negotiable. Whether you're running your Slash HD XL-5 as a casual weekend basher or pushing it harder in competitive environments, these gearbox halves are engineered to maintain performance consistency throughout your running sessions. The inclusion of the idler gear shaft ensures proper gear spacing and alignment, eliminating potential noise, vibration and power loss that would occur if these components were not correctly positioned relative to one another.

What's in the Box

• Gearbox half (left)
• Gearbox half (right)
• Idler gear shaft

Frequently Asked Questions

• What is a gearbox half and why would I need to replace it? — Gearbox halves are the two plastic or composite shells that house the gears and shafts of your RC vehicle's transmission. Over time, with intensive use, these components can develop cracks, wear down or become damaged, compromising the structural integrity of your drivetrain. Replacing them restores your vehicle to factory performance specifications and ensures longevity.
• Will these gearbox halves fit my Traxxas RC model? — These TRX3691 gearbox halves are specifically designed for the Traxxas Slash HD XL-5 short course truck range, including the blue, orange, green and red RTR variants. If you own one of these models, these halves will fit perfectly. For other Traxxas models, you'll need to verify compatibility with the model number before purchasing.
• Are these genuine Traxxas parts or aftermarket replacements? — These are genuine Traxxas original equipment manufacturer (OEM) parts, manufactured by Traxxas to their exact specifications and quality standards. Genuine parts ensure perfect fitment, authentic performance and reliability, whereas aftermarket alternatives may have compatibility issues or durability concerns.
• How difficult is it to install new gearbox halves? — Installation difficulty depends on your mechanical experience level. The process involves carefully disassembling your vehicle's drivetrain, transferring internal components like gears and bearings to the new halves, and reassembling everything with proper alignment. Many UK RC enthusiasts with intermediate to advanced mechanical skills can accomplish this, though complete beginners might benefit from instructional videos or professional assistance.
• What tools do I need to replace my gearbox halves? — Whilst the sources provided don't specify exact tools, typical gearbox replacement requires metric hex keys (Allen keys), small Phillips and flathead screwdrivers, and possibly a gear puller for bearing removal. A service manual specific to your Slash HD XL-5 variant will detail the precise tools and procedures needed.
• Can I use these halves as a preventative replacement rather than waiting for failure? — Yes, many experienced RC hobbyists replace gearbox halves proactively if they notice wear signs such as unusual noise, vibration or slight performance degradation. Preventative replacement can avoid catastrophic failure during important races or driving sessions, making it a sensible maintenance strategy for serious enthusiasts.
• What is an idler gear shaft and why is it included with these gearbox halves? — The idler gear shaft is a critical component that spaces and aligns the gears within your transmission, ensuring they mesh correctly and transfer power efficiently. It's included with these gearbox halves because it must be installed simultaneously to achieve proper gearbox assembly and function.
• Are there different versions of the TRX3691 gearbox halves available? — These particular halves come in black finish. Traxxas may offer other drivetrain components in different configurations, but this TRX3691 model specifically provides the left and right halves with idler gear shaft in black, designed for Slash HD XL-5 compatibility.
• How long do gearbox halves typically last before needing replacement? — Lifespan depends entirely on usage intensity, maintenance frequency and driving style. Casual weekend bashers may enjoy several seasons of use, whilst competitive drivers or those running consistently at high speeds may need replacements more frequently. Regular maintenance, proper lubrication and controlled driving can extend component life significantly.
• Can I buy individual gearbox halves or must I purchase left and right together? — The TRX3691 package includes both left and right halves plus the idler gear shaft as a complete assembly. This ensures compatibility and alignment across your entire gearbox, making it the correct way to perform a full gearbox replacement or rebuild.

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 Gearbox halves (left & right) (Black) with idler gear shaft TRX3691 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.