TAMIYA Hotshot / Super Hotshot / Boomerang / Bigwig Aluminum Rear Gear Box (Gun Metal) by JAZRIDER JR-THS13-GU  [JR-THS13-GU]

Aluminum rear gearbox for Tamiya Hotshot series

This JAZRIDER JR-THS13-GU aluminum rear gear box is a scale RC replacement part designed to mount where the stock plastic rear gearbox sits on classic Tamiya Hotshot lineage models. The gun metal finish and machined aluminum construction aim to provide a stiffer, more durable housing compared with the original plastic unit while keeping the same mounting footprint.

The part’s role is specific: it replaces the rear gearbox shell to influence rear-end rigidity and gearbox alignment, which can affect gear mesh, suspension response and durability under harder running or upgraded powertrains. Use it as a spares item when upgrading durability or recovering from a cracked stock case.

Installation notes: the unit matches the Hotshot family layout and retains original mounting points, so reuse of the vehicle’s original screws and internal components (gears, bearings, shafts) is typical. Check gear mesh and shaft alignment after fitting, and inspect seals or shims used in the original assembly — no specialized tools beyond standard hobby hex drivers are required for routine replacement.

Choose this aluminum rear gear box when you want a direct-fit metal replacement to stiffen the rear section and improve long-term resistance to impact and wear on Hotshot-series Tamiya models.