Overview
Transform your Traxxas TRX-4M into a true rock-crawling specialist with the Hot Racing Aluminum Ultra-Low-Range 68:1 Crawl Transmission. CNC-machined from 6061 aluminum and equipped with hardened steel gears and full ball-bearing support, this complete transmission upgrade delivers a dramatic 68:1 gear reduction — an ultra-low ratio purpose-built for technical rock crawling, ledge climbing, and steep terrain control.
The integrated sliding fine-tune motor mount makes gear-mesh adjustment quick and easy from the top of the chassis, while the aluminum heat sink fins help dissipate motor heat during long crawl sessions. A complete drivetrain transformation in a single bolt-on package.
Key Features
- Ultra-low-range hardened steel 68:1 gear set
- CNC-machined 6061 aluminum case, black anodized with silver lining
- Full set of gear box ball bearings included
- Sliding fine-tune motor mount for easy gear mesh adjustment
- CNC 6061 aluminum gear mesh window cover
- Sliding secure motor mount with double-screw lock
- Aluminum motor plate heat sink fins
- 10T to 17T 0.4 mod pinion gear support
Performance Benefits
- Dramatically improved low-speed control on technical lines
- Massive torque multiplication for steep climbs and ledges
- Easier, more confident scale crawling
- Better motor cooling via integrated heat sink
- Hardened steel gears far outlast plastic stock gears
Usage Notes
Replaces part of TRA 9747, 9791, 9791X, 9791R. Reuse stock outdrives (9747X). Designed for 180-size motors. Due to the bearing tolerance specification of this transmission, bushings may not fit. Use medium thread-locker on motor and case screws.
Technical Specs
- Case Material: CNC-machined 6061 aluminum
- Finish: Black anodized with silver lining
- Gear Material: Hardened steel
- Gear Ratio: 68:1 (ultra-low range)
- Bearings: Full ball-bearing supported
- Pinion Support: 10T-17T, 0.4 module
- Motor: 180-size compatible
What's Included
- One (1) aluminum sliding fine-tune motor mount transmission with hardened steel 68:1 gear set and full ball-bearing set
Fitment
- Traxxas TRX-4M (1/18 scale)
- Replaces part of TRA 9747, 9791, 9791X, 9791R
- Requires reuse of stock 9747X outdrives
Summary
The Hot Racing Aluminum Ultra-Low-Range 68:1 Crawl Transmission is a transformative upgrade for the TRX-4M platform. Hardened steel gears, aluminum case, ultra-low ratio, and easy gear mesh — everything you need for serious rock crawling.
