The JR-THS13-GU aluminium rear gearbox is an aftermarket shell built to replace the stock plastic case on TAMIYA Hotshot-series kits. Machined from aluminum and finished in gun metal, it is intended to reduce flex and keep gear mesh steadier under cornering and acceleration.
By stiffening the rear section, this housing can change suspension feedback and the way the rear end transmits load into the drivetrain. That influence can be useful when tuning setup for traction, acceleration or to support stronger motors and higher torque setups.
Fitting guidance: the unit retains the original mounting geometry so you normally reinstall the existing gears, shafts and bearings. After refit, rotate the drivetrain to confirm smooth operation and fine-tune gear mesh before final assembly.
Choose this aluminium shell when you need a direct-fit upgrade to sharpen rear-end behavior and support more demanding running conditions on Hotshot Tamiya models.
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