Upgrade a Traxxas TRX4 Trail Crawler using the GPM Aluminum Outer Portal Drive Housing to reduce play in the inner gears of front and rear knuckle arms. Built from aluminum 6061 T6, this lightweight replacement improves rigidity compared with the factory plastic parts while staying compatible with existing plastic components. The 3D streamlined shape gives a neat fit and a straightforward plug-and-play swap for quicker installation and reliable gear engagement.
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