Traxxas Shock Lower Retainer Brass 1/18 TRX-4M RC Crawler TRX9761A

Overview

The Traxxas Lower Retainer, Shock (Brass) TRX9761A is an essential suspension tuning component designed specifically for the TRX-4M 1/18 scale RC crawlers, including the Ford Bronco, Land Rover Defender, Chevrolet K10, and Ford F-150 High Trail models. These precision-engineered brass retainers represent a smart investment for any RC enthusiast in the UK looking to optimise their vehicle's handling characteristics and off-road performance. Whether you're tackling rocky terrain, navigating technical trails, or competing in RC car challenges, this suspension upgrade delivers tangible improvements to stability and climbing ability.

Brass lower spring retainers are a recognised performance modification in the RC crawler community, offering weight distribution benefits that serious hobbyists and weekend bashers alike appreciate. By adding strategic mass to the lowest point of your TRX-4M chassis, these retainers fundamentally alter your vehicle's centre of gravity, resulting in measurably better anti-rollover stability. This is particularly valuable when negotiating steep inclines, boulder fields, and the demanding technical courses that make crawling such an engaging RC discipline. RC car UK enthusiasts have long recognised that suspension tuning is just as important as engine power, and these brass retainers exemplify that philosophy.

Supplied as a complete set of four units (one for each shock), the TRX9761A integrates seamlessly with your existing TRX-4M platform. Each retainer weighs precisely 1 gram, giving you predictable, measurable weight addition that you can factor into your tuning calculations. This is the kind of precision engineering you expect from Traxxas, a manufacturer recognised worldwide for producing some of the finest ready to run RC vehicles and accessories available today.

Key Features

• Brass Construction — The choice of brass as the material is deliberate and engineered. Brass offers superior weight density compared to aluminium, meaning you get meaningful mass addition in a compact package. This material choice also provides excellent durability and corrosion resistance, essential for RC crawlers that often operate in damp, muddy, or wet conditions typical of UK terrain and weather.
• Precise 1 Gram Weight Per Unit — Each retainer is manufactured to exact specifications, weighing precisely 1 gram. This consistency allows you to plan your vehicle's weight distribution with scientific accuracy, enabling fine-tuned adjustments to suspension geometry and handling characteristics that directly impact climbing performance.
• Anti-Rollover Stability Improvement — By positioning additional weight at the lowest possible point of your TRX-4M chassis, these retainers lower your vehicle's centre of gravity. This fundamental physics principle dramatically improves stability during challenging manoeuvres, particularly when negotiating steep slopes, side-hilling technical sections, or recovering from near-rollover situations that would otherwise send your crawler tumbling.
• Superior Rock-Climbing Capability — The enhanced weight distribution directly translates to improved grip and traction during vertical or near-vertical climbs. When every gram counts in your pursuit to conquer demanding obstacles, these retainers give your TRX-4M the physical advantages needed to power through technical sections and maintain control on extreme terrain.
• Complete Set of Four Units — This package includes all four retainers needed for complete installation across all four shocks on your TRX-4M. You receive a full tuning solution without needing to source individual components, ensuring consistent performance across your entire suspension system.
• Direct Compatibility with TRX-4M Platform — These retainers are engineered specifically for Traxxas TRX-4M models, guaranteeing perfect fitment and integration with your existing suspension geometry. Whether you own the Ford Bronco, Land Rover Defender, Chevrolet K10, or Ford F-150 variant, these components will integrate seamlessly without modification or adaptation.

Technical Performance

The Traxxas Lower Retainer, Shock (Brass) TRX9761A represents the intersection of materials science and RC engineering. Brass is chosen deliberately over lighter materials because its superior density delivers meaningful weight in a compact form factor. When installed at the lowest point of your TRX-4M's chassis, these 1 gram retainers work in concert with the vehicle's suspension geometry to lower the overall centre of gravity. This seemingly small modification has profound effects on handling dynamics: your crawler becomes more resistant to rolling, maintains better contact with uneven terrain, and exhibits improved weight transfer during technical manoeuvres. The precision manufacturing ensures that all four retainers are identical, preventing any imbalance that could lead to unpredictable handling. For UK-based RC enthusiasts tackling everything from indoor technical courses to outdoor trail environments, the performance gains are immediately noticeable and worth the modest investment. The brass construction also ensures longevity; these components resist corrosion from moisture exposure, making them ideal for the variable British weather conditions that RC crawlers frequently encounter.

What's in the Box

• Lower Retainer, Shock, Brass — 4 pieces (1 gram each)

Frequently Asked Questions

• Will the Traxxas TRX9761A brass shock retainers improve my TRX-4M's climbing performance? — Yes, absolutely. By adding strategic weight to the lowest point of your chassis, these retainers lower your vehicle's centre of gravity, which directly improves your TRX-4M's ability to climb steep obstacles. The improved stability and weight distribution give your crawler better grip and traction when tackling vertical or near-vertical terrain, which is exactly what serious rock-crawling demands.
• Which TRX-4M models are these retainers compatible with? — These brass shock retainers are designed for all 1/18 scale TRX-4M models, including the Ford Bronco (available in Black, White, Area 51, Blue, Red, and Orange), Land Rover Defender (available in Silver, Tan, Black, Green, Light Blue, and Pink), Chevrolet K10 High Trail (available in Red, Black, and Blue), and Ford F-150 High Trail (available in Blue, Black, and Brown). If you own any TRX-4M variant, these retainers will integrate perfectly.
• How much weight do these retainers add, and will it affect my vehicle's speed? — Each retainer weighs precisely 1 gram, and you receive four units, meaning a total of 4 grams added to your TRX-4M. At this modest weight, you won't notice any significant speed reduction; instead, you'll gain the handling and stability benefits that make crawling more enjoyable and competitive. The weight addition is negligible in terms of raw speed but significant in terms of performance characteristics.
• Are these retainers difficult to install? — The TRX9761A retainers are suspension tuning components designed for users with basic mechanical knowledge of their TRX-4M platform. Installation involves removing existing lower shock retainers and replacing them with the brass versions. If you're familiar with basic RC maintenance and adjustment, installation is straightforward. If you're new to RC tuning, visiting an experienced RC shop or watching installation guides specific to the TRX-4M will help you understand the process.
• Will brass shock retainers corrode in damp conditions? — Brass is significantly more corrosion-resistant than steel and doesn't rust like iron-based metals. For UK RC enthusiasts who frequently operate in damp conditions or near water, brass construction is an excellent choice. Simple rinsing with fresh water after muddy sessions will keep these components in perfect condition indefinitely.
• What's the difference between brass and aluminium retainers? — Brass is approximately 2.7 times denser than aluminium, meaning the same weight brass component is much smaller than an aluminium equivalent. Since these retainers need to add weight for handling improvements, brass delivers the required mass in a compact form. Additionally, brass offers superior corrosion resistance compared to aluminium, which can oxidise and weaken in harsh environments.

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 Lower retainer, shock (Brass) (4 pcs) TRX9761A 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.