Build your own portal axles, high/low range transmission, and remotely locking differentials. All the parts are organized neatly in labeled bags with waterproof electronics and pre-assembled shocks and suspension links. A fully illustrated color manual makes the kit as much fun to construct as it is to take off-road.
The TRX-4 Chassis Kit isn’t just for expert hobbyists. Traxxas goes the extra mile to make the full-color instruction book easy to follow and fun to use. Each section corresponds to a labeled bag with step-by-step assembly instructions. True-to-scale part illustrations and ruler charts make it easy to differentiate between different screws, bearings, and gears. Helpful assembly tips and clear illustrations take the frustration out of the assembly process. Have fun on the workbench and on the trail with the new TRX-4 Chassis Kit.
The TRX-4 Chassis Kit arrives ready to assemble with a full-color instruction guide, TQi 4-channel 2.4GHz radio system, and complete waterproof electronics including servos, XL-5 HV ESC, and Titan 21T motor. Key parts like shocks and suspension links come pre-assembled to make building easy and fun. Choose your own body, battery, and charger (sold separately) to complete your custom ride. A staff of skilled representatives is on hand to answer your questions via phone, website, or e-mail. Unmatched parts support keeps your Traxxas vehicle running strong with parts and support from thousands of hobby dealers worldwide. Traxxas goes the extra mile to ensure that your RC experience is easy and fun.
Includes:
Unassembled TRX-4 Chassis Kit
TQi™ 2.4GHz 4-channel radio system with 4 servos
XL-5 HV waterproof ESC
Titan® 21T 550 motor
Full-color step-by-step assembly manual
Requires:
TRX-4 compatible body
4 AA alkaline batteries
Battery with Traxxas High-Current Connector
6 or 7 cell NiMH battery pack
2s or 3s LiPo battery pack
Battery charger
Metric hex drivers
1.5mm, 2.0mm, 2.5mm
Basic hand tools
screwdrivers, needle nose pliers
Traxxas Ultra-Premium Tire Glue or CA glue
Safety glasses
Features:
Easy to follow full-color assembly manual
True-to-scale part illustrations and ruler charts
Helpful assembly tips and clear illustrations
Trail-tuned XL-5 HV Waterproof Electronic Speed Control
Fully waterproof design
Five drive profiles
Sport Mode — forward / brake / reverse
Race Mode — forward / brake / no reverse
Training Mode™ — 50% forward / 100% brake / 50% reverse (patented)
Trail Mode — forward / brake / reverse / with trail-tuned drag brake in neutral
Crawl Mode — forward / instant reverse - no neutral with 100% hill holding brake
Traxxas EZ-Set® one-button setup
Large, efficient heat sink
Wide voltage latitude 6–7 cell NiMH (7.2–8.4V) and 2–3S LiPo (7.4–11.1V)
Two stage low voltage protection (LVD)
Powerful Titan™ 21T reverse rotation motor
Internal cooling fan
Precise, preset gear mesh adjustments
Motor retention separate from gear mesh
Portal Axles
Increase ground clearance (3.14”)
Eliminate torque twist
Steel gears
Improve axle geometry and reduce strain on driveshafts
Rigid Steel Frame
1.5mm thick steel frame rails increase torsional rigidity
Innovative design allows four wheelbase positions (300mm, 312mm, 324mm, 336mm)
Adjustable rear shock tower positions
Bumpers adjust fore and aft
Rugged rock rails adjust for width
Wire routing clips integrated into frame rails
Drivetrain
Full-time shaft driven 4-wheel drive
Tough 6mm stub axles
Steel front CV driveshafts
Hardened steel rear axle shafts
Remote locking steel gear differentials with cable-actuation
Steel gear transfer case
Innovative Battery Compartments
Hinged battery strap allows quick and easy battery access
No pins to lose
Accommodates different height batteries
Accepts full-size long battery packs
Integrated compartment accepts smaller 1/16 scale batteries (with optional strap)
Secondary battery mount over front axle for forward weight bias
Two speed high/low range transmission with remote shifting
Dual horizontal shafts
Twin friction plate slipper clutch
Easily removed for servicing
Steering
Chassis mounted 2075X metal gear digital servo
Superior 45° steering angle
Direct steering (no servo saver)
Steering geometry corrected for bump steer
Suspension
Front — 3 link with panhard
Rear — Triangulated 4 link
Pre-assembled heavy-duty rod ends with steel hollow balls
5mm diameter steel link rods with 4mm threaded ends
Pre-assembled aluminum GTS Shocks
Coilover GTS shocks exclusive to TRX-4 chassis
Silver-anodized aluminum bodies
Threaded bodies with collars easily adjust ride height
Silky smooth damping for the toughest trails
O-ring cap seal and dual X-ring shaft seals
Shock oil included in kit
Wheels and Tires
1.9” Canyon Trail tires with trail-tuned foam inserts
Tough black scale wheels
Trail tuned S1 rubber compound
12mm steel hex
Tire glue required
TQi™ 2.4GHz 4-channel transmitter
Traxxas Link enabled
Telemetry ready #6533 5-channel micro receiver with failsafe
Automatically stores and loads settings for up to 30 Traxxas Link enabled models
Exclusive Cruise Control feature for extended trail driving
Adjustable steering and throttle sensitivity (exponential)
Adjustable steering and throttle endpoints
High 13ms frame rate and near-zero latency for responsive control
Patented O-Ring sealed watertight receiver box keeps the micro receiver dry
Sealed Ball Bearings
Hex hardware with rust-resistant black oxide coating
Specs:
TRX-4 CHASSIS KIT SPECS
Length: 20.57 inches (523mm)
Front Track: 9.78 inches (249mm)
Rear Track: 9.78 inches (249mm)
Ground Clearance: 3.14 inches (80mm)
Weight: 6.42lb (2.91kg)
Height: 10.47 inches (266mm)
Wheelbase: 12.28 inches (312mm)
Front Shock Length: 3.54 inches (90mm)
Rear Shock Length: 3.54 inches (90mm)
Approach Angle: 63.82°
Departure Angle: 43.22°
Breakover Angle: 58.93°
Front Wheels: 1.9 x 1.02 inches (49 x 26mm)
Rear Wheels: 1.9 x 1.02 inches (49 x 26mm)
Front Tires: 4.64 x 1.89 inches (118 x 48mm)
Rear Tires: 4.64 x 1.89 inches (118 x 48mm)
Wheel Hex: 12mm
Speed Control: XL-5™ HV
Motor (electric): Titan® 21T Reverse Rotation
Differential Type: 4 Gear, Remote Locking
Transmission: 2-speed Hi-Lo, Remote Shifting
Gear Pitch: 32
Chassis Structure/Material: Steel Ladder Frame with Nylon Composite Crossmembers
Brake Type: Electronic “Hill Hold”
Drive System: Shaft-Driven 4WD
Steering: Chassis Mounted 2075X Metal Gear Servo
Radio System: TQi™ 2.4 GHz 4-Channel Transmitter with #6533 Receiver
Skill Level: 2
Battery Tray: 158.75 L x 47 W x 23/26mm