Traxxas TRX-4 Unassembled Chassis Kit 1:10 4WD Electric Trail Crawler (+ TQi 4-ch, XL-5 HV, Titan 550, Clipless Body) TRX82216-4-R6

Overview

The Traxxas TRX-4 Unassembled Chassis Kit represents the pinnacle of trail-crawling excellence, now available as a challenging and rewarding build-it-yourself project for RC enthusiasts across the UK. This 1:10 scale 4WD electric trail crawler combines Traxxas's legendary engineering with the satisfaction of hands-on assembly, making it an ideal choice for experienced RC hobbyists who want complete control over their vehicle from the ground up. Whether you're looking for a serious off-road RC car UK that can tackle rocky terrain, steep hillsides, and extreme obstacles, or you're seeking a ready-to-customize platform that lets you personalise every aspect of your build, the TRX-4 Unassembled Kit delivers uncompromising performance and versatility.

What sets the TRX-4 apart in the competitive world of RC trail trucks is its comprehensive feature set, which includes portal axles for increased ground clearance, a dual-range transmission for both high-speed trails and technical crawling, and remote-locking differentials that give you complete control over traction in real-time. The kit arrives with a full-colour assembly manual that transforms what could be a daunting project into an enjoyable building experience, with all components organised in labelled bags and critical elements like shocks and suspension links pre-assembled to save time without compromising the satisfaction of construction.

This unassembled RC crawler is powered by Traxxas's battle-tested waterproof electronics suite, including the TQi 2.4 GHz radio system with modern Traxxas Link Wireless App compatibility, the trail-tuned XL-5 HV waterproof electronic speed control, and a potent Titan 21T reverse-rotation motor that delivers the torque needed for serious terrain. With its innovative clipless body mounting system, impressive ground clearance of 3.14 inches, and rigid steel frame construction, the TRX-4 Unassembled Chassis Kit is purpose-built for adventurous RC drivers who refuse to compromise on capability or durability.

Key Features

• Portal Axles with Optimised Geometry — Portal axles are positioned above the wheel hubs to increase your ground clearance to an impressive 3.14 inches, allowing the TRX-4 to clear obstacles that would stop conventional crawlers, whilst the optimised axle geometry and torque reduction system ensure reliable power delivery to all four wheels without excessive strain on the drivetrain.
• Dual-Range Two-Speed Transmission — The high/low range transmission is remotely selectable, giving you the flexibility to engage high-speed mode for fast trail running or low-range mode for technical rock crawling and climbing, all without stopping or exiting the vehicle to make manual adjustments.
• Remote-Locking Differentials — Four-gear remote-locking differentials on both front and rear axles let you lock or unlock traction in real-time via your transmitter, providing maximum traction when climbing or crossing obstacles and open differential performance for smooth turning on easier terrain.
• XL-5 HV Trail-Tuned Electronic Speed Control — Fully waterproof ESC with five customisable drive profiles (Sport, Race, Training, Trail, and Crawl modes) that allow you to tailor the vehicle's behaviour to different terrain types and skill levels, plus electronic hill-hold braking that prevents the truck from rolling backwards on steep inclines.
• Titan 550 21-Turn Motor — A powerful brushed motor featuring precision 21-turn windings, internal cooling fan technology, and adjustable performance characteristics that deliver the low-end torque essential for crawling whilst maintaining respectable trail speeds when needed.
• TQi 2.4 GHz Radio System — Advanced four-channel transmitter operating on the reliable 2.4 GHz frequency with Traxxas Link Wireless App compatibility, allowing you to adjust vehicle settings, monitor telemetry, and tune performance from your smartphone even whilst driving; includes six-channel receiver and pre-installed servos.
• Rigid Steel Ladder Frame — Heavy-duty steel frame rails provide exceptional torsional rigidity for improved handling and durability, whilst nylon composite cross members keep weight manageable; adjustable wheelbase allows you to fine-tune handling characteristics for your preferred driving style.
• Aluminium GTS Oil-Filled Shocks — Pre-assembled shock absorbers with adjustable threaded bodies allow for easy ride-height and damping adjustments, delivering the silky-smooth suspension performance required for comfortable trail running over rocks, roots, and rough terrain without bottoming out on obstacles.
• Full-Time 4-Wheel Drive System — Shaft-driven four-wheel drive with steel gears and hardened axles ensures power reaches all four wheels simultaneously, providing superior traction in challenging terrain whilst the robust construction ensures years of reliable service even in demanding conditions.
• Clipless Body Mounting System — Hidden latching mechanism provides clean, flowing lines for scale authenticity whilst the innovative design allows you to remove the body in just seconds for chassis maintenance and component access; compatible with any Traxxas 312 mm wheelbase body for extensive customisation options.
• Trail-Tuned 1.9" Canyon Trail Tyres — Pre-glued on durable black wheels and wrapped in 4.64 x 1.89 inch Canyon Trail tyres featuring trail-tuned foam and S1 rubber compound specifically formulated to bite into loose surfaces and provide consistent grip across varied terrain types.
• Waterproof Electronics Throughout — All electronic components including servos, ESC, and receiver are sealed against water intrusion, allowing you to ford shallow streams and navigate wet conditions without fear of electrical failure, extending your trail-running opportunities year-round.
• Cable-Actuated Differential Lock — Mechanical control of front and rear differential lock status via cable actuation ensures reliable engagement and disengagement of traction control with no electronic components to fail in the differential mechanism itself.
• Quick-Access Battery Compartment — Innovative hinged strap design allows rapid battery installation and removal, supporting a wide variety of NiMH and LiPo battery types and sizes without requiring extensive disassembly of the chassis.

Technical Performance

The TRX-4 Unassembled Chassis Kit represents a sophisticated engineering achievement in 1:10 scale RC crawling, combining premium materials and proven technology to deliver exceptional off-road performance. Measuring 20.57 inches in length with a 12.28-inch wheelbase, the TRX-4 achieves an impressive 3.14-inch ground clearance through its portal axle design, whilst maintaining a balanced weight of 102.72 ounces that optimises both traction and manoeuvrability. The approach angle of 63.82° and departure angle of 43.22° give the crawler remarkable ability to surmount obstacles that would challenge vehicles with conventional suspension geometry. The rigid steel ladder frame construction with nylon composite cross members provides the strength needed for aggressive trail abuse whilst keeping overall weight in check. The full-time 4WD drive system with shaft drive ensures consistent power delivery, whilst the two-speed transmission (selectable high/low range) and four-gear remote-locking differentials grant unprecedented control over traction in real-time during challenging climbs and technical sections. The XL-5 HV ESC with waterproof housing manages the Titan 21T brushed motor's power output with sophisticated digital control, offering five distinct driving profiles to match any trail condition from leisurely exploration to competitive rock-crawling events. The TQi 2.4 GHz radio system operates on the modern frequency standard that eliminates interference issues, providing four channels of control with servo feedback and onboard receiver stability. The pre-assembled Aluminium GTS shock absorbers, each 3.54 inches in length at both front and rear, feature adjustable threaded bodies allowing fine-tuning of compression and rebound damping to suit your preferred suspension stiffness. The 1.9-inch wheels and 4.64 x 1.89-inch Canyon Trail tyres with S1 rubber compound provide exceptional grip across dirt, rock, and loose surfaces. Battery compatibility is exceptionally flexible, accepting NiMH batteries from 4 to 7 cells or LiPo batteries from 2S to 3S capacity, giving you freedom to choose power sources based on your driving style and available budget. The 159 x 47 x 23/26mm battery tray accommodates both stick packs and hard-case LiPo batteries, whilst the innovative hinged strap system allows tool-free battery swaps between runs.

What's in the Box

• 1x TRX-4 Unassembled Chassis Kit (main vehicle frame and mechanical components)
• 1x TQi 2.4 GHz Four-Channel Radio System with 6533 receiver
• 1x XL-5 HV Trail-Tuned Waterproof Electronic Speed Control
• 1x Titan 21T Reverse-Rotation Brushed Motor
• Pre-assembled front and rear aluminium GTS oil-filled shock absorbers
• Pre-assembled suspension links and battery mounting hardware
• T-Lock front and rear differential assemblies (remote locking)
• Two-speed high/low range transmission with servo-actuated shifting
• Steel ladder frame chassis with nylon composite cross members
• 1.9-inch wheels with pre-glued 4.64 x 1.89-inch Canyon Trail tyres
• Waterproof servo motors and receiver with sealed connectors
• Complete full-colour illustrated assembly manual with step-by-step instructions
• Labelled component bags organised by assembly section
• Hardware kit including fasteners, bearings, gears, and linkages

What You Need to Complete

• Battery — The TRX-4 accepts a wide variety of NiMH (4-7 cell) and LiPo (2S-3S) batteries; options range from budget-friendly NiMH packs to high-performance LiPo options depending on your performance requirements and budget
• Charger — A Traxxas EZ-Peak charger is recommended for easy and fast charging performance; the EZ-Peak Live charger (model 2971) offers smart charging features and safety protection for all battery types
• Four AA Alkaline Batteries — Required to power the TQi transmitter; standard off-the-shelf AA batteries work perfectly, though rechargeable NiMH AA packs can reduce operating costs

Frequently Asked Questions

• Is the TRX-4 Unassembled Chassis Kit suitable for beginners? — Whilst the TRX-4 is classified as Skill Level 3, it's not recommended for absolute beginners to RC. However, if you have previous RC experience or don't mind taking your time working through the detailed full-colour assembly manual, you'll find the kit quite manageable. The manual is exceptionally clear with step-by-step instructions and labelled component bags, making the build process logical and straightforward. If this is your first RC vehicle, you may want to consider a Ready-to-Run (RTR) model first to gain experience before tackling an assembly kit.
• What batteries does the TRX-4 accept and what's the difference between NiMH and LiPo? — The TRX-4 accepts both NiMH batteries (4-7 cell configurations) and LiPo batteries (2S or 3S). NiMH batteries are more forgiving, cheaper, and more durable for beginners, though they're heavier and don't perform as well at high speeds. LiPo batteries offer superior power delivery, lighter weight, and better performance, but require careful handling, proper charging with a smart charger, and storage in a fireproof container. For trail crawling, either type works well—choose based on your budget and experience level.
• How long does assembly take and what tools do I need? — Most builders report assembly taking 4-8 hours depending on experience and attention to detail. You'll need standard RC tools including metric hex wrenches, Phillips and flat-head screwdrivers, and possibly a small wrench set for adjusting suspension components. The kit includes labelled bags for each assembly section, making the process systematic and manageable. Traxxas sells an optional metric hex driver essentials set if you don't already own proper RC tools.
• What makes the TRX-4 better than other 1/10 RC crawlers? — The TRX-4 stands out through its innovative portal axle design for increased ground clearance, remote-locking differentials for real-time traction control, two-speed transmission for both high-speed trails and technical crawling, waterproof electronics throughout, and exceptional build quality. Competing models often lack this combination of features or use less sophisticated control systems. The TRX-4's clipless body mounting is also unique, allowing rapid body removal for maintenance without disturbing the chassis assembly.
• Is the TRX-4 waterproof and can I run it in water? — All electronics are sealed and waterproof, allowing you to ford shallow streams and navigate wet terrain without concern. However, it's not designed for prolonged submersion or saltwater use. After running in wet conditions, rinse the electronics gently with fresh water and allow everything to dry completely before storing.
• Can I upgrade the motor and ESC? — The Titan 21T motor and XL-5 HV ESC are already high-quality components suitable for most trail use. However, the TRX-4 platform is extremely modular, and Traxxas manufactures various upgrades. For serious crawling, many owners explore brushless motor and ESC combinations, though these require compatibility verification and may impact warranty status.
• What's the difference between this kit and a Ready-to-Run TRX-4? — The primary difference is assembly. This kit requires you to build the chassis yourself, which takes time but offers the satisfaction of hands-on construction and a deeper understanding of how the vehicle works. Ready-to-Run models arrive fully assembled and ready for immediate use. Both use identical mechanical platforms and electronics, so performance is equivalent once the kit is completed.
• Does this come with a body? — No, this kit doesn't include a painted body. It arrives as a bare chassis. However, the clipless mounting system accepts any Traxxas 312 mm wheelbase body (sold separately), giving you extensive customisation options including various truck styles and scales.
• What's included in the clipless body mounting system? — The clipless system uses hidden latches that hold the body securely during driving but allow rapid removal without tools or fasteners. This makes accessing the chassis for maintenance and customisation incredibly convenient whilst maintaining clean lines for scale authenticity.

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 TRX-4 Unassembled Chassis Kit 1:10 4WD Electric Trail Crawler (+ TQi 4-ch, XL-5 HV, Titan 550, Clipless Body) TRX82216-4-R6 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.