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ARRMA 1/10 Big Rock 4x4 BLX 3S (V3) Brushless RC Monster Truck - Black ARA4312V3


ARRMA 1/10 Big Rock 4x4 BLX 3S (V3) Brushless RC Monster Truck ARA4312V3 - Black is Back!

The BIG ROCK 4X4 3S BLX is DESIGNED FAST, DESIGNED TOUGH — built for exciting bashing speeds and extreme, all-terrain durability. New features that enhance its unstoppable performance include a stronger chassis and retained hinge pin plates; steering with more clearance for stones; a castellated slipper pad and sliding gear mesh; longer suspension arms for a 1.10 inch increase in width; and rubber-shielded bearings throughout.

ARRMA 1/10 Big Rock 4x4 BLX 3S (V3) Brushless RC Monster Truck - Black

It also now includes a Spektrum SLT3 transmitter and SLR300 receiver. The transmitter is ergonomically designed for long periods of fatigue-free bashing and has a foam wheel for precise fingertip control, plus an improved handgrip and trigger feel. New bashers will be able to set throttle limits at 50% or 75% until they are ready to use the full speed potential. The SLT3 is compatible with Tactic SLT receivers to run other RTR vehicles you may own, and includes a third channel to control optional features such as lights and winches on models that have them.

ARRMA now powers the BIG ROCK 4X4 3S BLX with a brushless system featuring its BLX100 ESC and the Spektrum Firma 3200Kv brushless motor. The combination provides incredible torque, acceleration and speed. The transmission and chassis are ruggedly engineered to take full advantage of the electronics’ power.

The self-bleeding, oil-filled shocks, now with silicone O-rings, use a tried and tested, coil-over design for simple maintenance and amazing handling. Their innovative rod-end has a moulded-in spring perch for extra toughness. Extended height dirt defenders and a close-fitting body limit the amount of dirt and debris that can get into the chassis tub. Front and rear bumpers offer defence against impacts.

Accented by matte black front and rear bumpers and wheels, the BIG ROCK 4X4 3S BLX truck’s long, scale Crew Cab body marks the epitome of street style. With the included dBoots RAGNAROK MT tires, you’ll take it on the run over dirt tracks, trails and even muddy courses. An adjustable wheelie bar comes as standard, letting you enjoy a little stunt fun along the way.

The ARRMA BIG ROCK CREW CAB 4X4 3S BLX offers scale realism, dirt-chucking action and 50+ mph speed potential! It’s also updated with a Spektrum SLT3 radio, Firma brushless motor, tougher chassis, wider stance, stronger steering servo and more.


  • NEW for the ARRMA BIG ROCK 4X4 3S BLX RTR:
  • Spektrum 3-Channel SLT3 2.4GHz radio and SLR300 Waterproof* Receiver
  • Fast response SLT protocol
  • Foam wheel
  • Improved grip and trigger feel
  • Improved wheel and trigger force
  • 2-way thumb switch third channel
  • 50% and 75% Throttle mode (for beginners)
  • Tactic SLT receiver compatible
  • Spektrum SPMS651 Metal-Geared Digital Servo
  • 101 oz-in (7.27 kg-cm) @ 6V
  • 15% more torque than the previous ADS-7M servo for improved steering feel
  • Waterproof*
  • Spektrum Firma 3660 3200Kv brushless motor with Safe D pinion and ARRMA heatsink and cooling fan
  • Stronger chassis and retained hinge pin plates
  • Steering with more clearance for stones
  • Castellated slipper pad and sliding gear mesh
  • 1.1 inch wider stance for better handling and bashing
  • Plastic locknut for slipper
  • 23T Spline servo saver
  • 37T 1.35Mod diffs with silicone O-rings
  • Power Module with sliding gear mesh and improved dirt management
  • Rubber shielded bearings throughout
  • Oil-filled shocks with silicone O-rings
  • Wider arms front and rear
  • Body with matte black finish
  • Front and rear bumpers with matte black finish
  • Tough black multi-spoke wheels with matte black finish
  • Vented multi-terrain dBoots RAGNAROK tyres

Proven popular features Designed to be Fast, Designed to be Tough

  • BLX100 2S/3S waterproof* ESC
  • IC5 connectors (EC5) compatible
  • Signature easy-access modular design
  • Easy-access power module
  • Easy-access electronics module
  • Easy-access diff module removal front and rear
  • Double wishbone suspension front and rear
  • Metal-geared differentials
  • Extended height dirt defenders
  • Adjustable ride height
  • Adjustable body mounts
  • Adjustable turnbuckles
  • High-speed center driveshaft support
  • Wheelie bar
  • 2-year limited warranty (see website for details)
  • 50+ MPH (80+ km/h) speed achievable in optimum driving conditions on 3S LiPo


  • Completion Level : Ready-to-Run
  • Scale : 1/10
  • Length : 20.24 in (514mm)
  • Height : 7.91 in (201mm)
  • Width : 14.02 in (356mm)
  • Weight : 6.25 lb (2.84kg)
  • Ground Clearance : 2.17 in (55mm)
  • Wheelbase : 12.87 in (327mm)
  • Front Track : 14.02 in (356mm)
  • Rear Track : 14.02 in (356mm)
  • Chassis : Moulded Composite
  • Suspension : Independent
  • Shock Type : Oil-Filled, Coil-Over Springs
  • Drivetrain : 4WD
  • Differential : 2 Gear Diffs
  • Wheel Type : MT (2.8" 14mm hex)
  • Wheel Diameter : 2.81 in (71.5mm)
  • Tyre Tread : dBoots Ragnarok MT
  • Tyre Diameter : 5.12 in (130mm)
  • Motor Type : Non-Sensored Brushless
  • Motor Size : 3660
  • Pinion : 15T
  • Spur Gear : 57T
  • Gear Pitch : 0.8MOD
  • Internal Gear Ratio : 2.85
  • Final Drive Ratio : 10.83
  • Speed Control Included : Yes
  • Radio : Spektrum SLT3 3-channel
  • Servos Included : Yes
  • Body : Painted, decalled and trimmed
  • Ball Bearings : Ball bearings throughout
  • Experience Level : Intermediate
  • Recommended Environment : All-Terrain!


  • 2S or 3S LiPo Battery
  • Compatible Charger
  • LiPo Safe Charging Bag
  • (4) AA Batteries