TRX4-M Stainless Steel Transmission Gear Pinion Set – RC Crawler

Stainless Steel TRX4-M Overdrive & Underdrive Transmission Gear Pinion Set

Take your 1/18 scale RC crawler to the next level with this precision CNC-machined stainless steel transmission gear set designed specifically for the Traxxas TRX4-M. Whether you're pushing for top-end speed on open terrain or crawling through tough obstacles at ultra-low speeds, this three-ratio gear set gives you the flexibility to tune your rig exactly how you want it.

Why Upgrade to This Gear Set?

The factory plastic gears in the TRX4-M can wear quickly under demanding use. This full stainless steel replacement set offers exceptional durability, tighter tolerances, and consistent performance run after run — a must-have upgrade for serious RC enthusiasts.

Key Features

• CNC Machined Stainless Steel — High-strength material for long-lasting, precise gear mesh
• Three Gear Ratios Included — One set covers stock, overdrive, and underdrive configurations
• Stock Ratio (16.6:1) — Same as factory; a like-for-like replacement for worn OEM gears
• Overdrive / High-Speed Ratio (9.7:1) — Increases top speed by approximately 71% for fast-paced bashing and open-ground runs
• Underdrive / Low-Speed Ratio (40.3:1) — Reduces speed by approximately 59%, delivering massive torque multiplication for technical crawling
• 11-Tooth Motor Pinion Included — Everything you need for a complete swap is in the box
• Helical Ring Gear Profile — Smoother, quieter engagement compared to standard spur gears
• Lightweight — Only 15g (0.53 oz) total, keeping your crawler's weight in check

Specifications

What's in the Box?

• All transmission gears (stock, overdrive, and underdrive)
• 1× 11-Tooth motor pinion gear

Related Tools & Accessories

Keep your RC workshop fully equipped with these handy tools:

• 10-in-1 Multi-Functional Bone Wrench Hex Socket Spanner – Portable Repair Hand Tool
• 16-in-1 Multi-Function Portable Folding Hex Wrench Set – Repair Hand Tools
• 3-in-1 Precision Mini Screwdriver Keychain – Portable Repair Hand Tool

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Frequently Asked Questions

Q: Is this TRX4-M transmission gear set compatible with the standard 1/18 Traxxas TRX4-M crawler?

A: Yes, this stainless steel gear pinion set is designed specifically for the Traxxas TRX4-M 1/18 scale RC crawler. All three gear ratios — stock 16.6:1, overdrive 9.7:1, and underdrive 40.3:1 — are precision-machined to fit the TRX4-M transmission housing as a direct upgrade replacement.

Q: Do I need any other parts to install this TRX4-M gear upgrade set?

A: The set includes all transmission gears and an 11-tooth motor pinion, giving you everything needed for a complete ratio swap. Basic RC tools such as hex drivers are recommended for installation. No additional gear parts are required.

Q: What is the benefit of switching to the overdrive (9.7:1) gear ratio on my TRX4-M?

A: The 9.7:1 overdrive gear ratio increases your TRX4-M's top speed by approximately 71% compared to stock. This makes it ideal for open terrain bashing or speed runs where maximum velocity is the priority over crawling torque.

Q: Why choose stainless steel gears over the factory plastic gears?

A: Stainless steel offers significantly greater hardness and wear resistance than standard plastic transmission gears. CNC machining ensures tight tolerances for smooth, consistent gear mesh, reducing drivetrain slop and extending the life of your TRX4-M's transmission considerably.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.