⚙️ Ultimate Torque. Total Control.
Boost your TRX4M’s crawling power with the INJORA CNC Aluminum Complete Transmission, pre-assembled and precision-machined for maximum strength and performance. Featuring the 40.3:1 underdrive gear ratio, this transmission delivers extreme torque and smooth throttle response — perfect for technical rock crawling and slow-speed control.
⚡ Features:
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🧱 Pre-assembled and ready to install
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💪 High-torque 40.3:1 underdrive gearing for maximum low-end power (≈ -59%)
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⚙️ CNC-machined aluminum housing for strength and durability
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🖤 Black anodized finish for a clean, factory look
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🧩 Direct bolt-on fit for the TRX4M — no modification required
📏 Specifications:
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Part Number: 4M-55UD-BK
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Material: CNC Aluminum
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Color: Black
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Internal Ratio: 40.3 : 1 (Underdrive 59%)
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Weight: 32 g (1.13 oz)
📦 Includes:
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(1) Pre-assembled INJORA CNC Aluminum Complete Transmission
🔧 Compatibility:
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1/18 Traxxas TRX4M (Defender / Bronco / K10 / F-150)
💡 Pro Tip:
Pair this with INJORA brass links and weighted wheels for unstoppable torque, precise control, and better stability on steep climbs.
