This aluminium alloy gearbox is a direct replacement housing developed for the HPI Savage Nitro Off Road Series. Finished in purple, the shell replaces the stock plastic casing to give a firmer mounting platform for spur and pinion alignment and to better support drivetrain parts during hard off-road use.
Primary purpose: chassis rigidity and repeatable setup. The aluminium shell helps keep gear mesh stable under load and streamlines adjustments when setting spur height or swapping bearings. The unit is supplied as a single housing piece and does not include internal gears or bearings.
Installation guidance: you will need to remove the factory plastic housing and transfer internal parts. Keep the original fasteners where possible and check gear mesh and backlash after fitting. Verify screw lengths and any shims before final assembly to avoid pinion or spur interference.
Choose this alloy gearbox when you want a stiffer housing for more consistent setup and improved drivetrain alignment on HPI Savage models; it is aimed at hobbyists who need reliable behaviour without altering gear ratios.
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