Traxxas TRX4 Open Stainless Shim 5.2x8.0x1.3 TRX4010/OPSH by GPM  [TRX4010/OPSH]

Slip-on open shim for TRX4 driveline tweaks

This stainless steel open shim is sized 5.2x8.0x1.3 for fine stack and spacing adjustments on Traxxas TRX4 components that use the TRX4010/OPSH interface. The C-shaped profile allows you to fit the washer over shafts or pinion areas without full disassembly, so small clearance changes can be tested quickly.

Use the shim to reduce minor axial play, establish repeatable bearing preload, or set gearbox and axle stack height for trail crawling setups. The steel construction preserves thickness and flatness under load better than softer spacers, helping tuning stay consistent during runs.

Installation is simple: clean mating surfaces, slide the open shim into position, confirm fit and rotational clearance, then rotate the drivetrain slowly to check for binding before full operation. Always keep shims paired and record their positions when evaluating different stack arrangements.