Parts/Drivetrain/Axles & axle parts/Injora Aluminum Planet Front & Rear Straight Axles Set for Traxxas® TRX-4M® w/Hydraulic Steering (Black) (+7mm) (Lay Down Servo)
Injora Aluminum Planet Front & Rear Straight Axles Set for Traxxas® TRX-4M® w/Hydraulic Steering (Black) (+7mm) (Lay Down Servo)
Injora

Injora Aluminum Planet Front & Rear Straight Axles Set for Traxxas® TRX-4M® w/Hydraulic Steering (Black) (+7mm) (Lay Down Servo)

Part # INJ4M-121BKFR
Where to buy
$107.99
AMain Hobbies
Seen Oct 12, 2026
$107.99Buy
Prices are as last seen at the store; stock is not tracked.

About this part

Axle Overview:

Upgrade your TRX-4M® crawler with the Injora +7mm Planet Straight Axles Front and Rear Set, featuring Double Joint Shafts and a Scale Hydraulic Ram Steering System. Designed as a complete straight axle upgrade, this set enhances stability, steering precision, and off-road control while delivering a highly realistic scale appearance. Pre-assembled, CNC-machined, and constructed with premium materials, these axles provide smooth, reliable operation for both the front and rear of your crawler.

About the Planet Straight Axles with Hydraulic Steering


Scale Hydraulic Ram Steering

The simulated double-ended hydraulic ram steering system delivers an authentic scale look while improving steering control and responsiveness. Paired with brass steering knuckles, it adds beneficial front-end weight for increased traction and more confident turning during technical crawling.

Planet-Inspired Straight Axle Design

Each straight axle features a CNC-machined, planet-shaped differential housing for exceptional scale realism and precision. Double joint shafts minimize outer wheel vibration at extreme steering angles, while the +7mm extended width improves stability and control across both front and rear axles. Durable 12T and 24T alloy steel helical gears ensure smooth power delivery and long-lasting reliability.

Ultimate Crawling Upgrade

Engineered as a complete front and rear straight axle system, this set enhances handling, durability, and scale authenticity without relying on portal-style ground clearance gains. Lightweight aluminum housings and steering links, combined with brass and steel components, create a balanced upgrade ideal for serious hobbyists and detailed TRX-4M® builds.

Features:

  • Front and rear straight axles with +7mm extended width
  • Scale hydraulic ram steering system for realistic appearance
  • Planet-shaped differential housings CNC-machined for precision
  • Double joint shafts reduce wheel vibration at extreme angles
  • Brass steering knuckles add weight for improved traction
  • 12T and 24T alloy steel helical gears for smooth, durable meshing
  • Pre-assembled for quick and easy installation
  • Aluminum housings and steering links for lightweight strength

Includes:

  • (1) Front and Rear +7mm Planet Straight Axle Set
  • (1) Aluminum Steering Links Set
  • (2) Brass Steering Knuckles
  • Assembly Hardware

*Tech Note: Not compatible with stock TRX-4M® chassis due to wider design. Compatible with the Injora universal chassis.

CA Residents Prop 65 Warning WARNING: This product can expose you to chemicals including Di(2-ethylhexyl)phthalate (DEHP), which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov Details...

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