This GPM upgrade set replaces the standard gear interface on TRAXXAS SLASH 4X4 Low-CG variants specified for the 68086-21 version. It pairs a low centre aluminium adapter with hardened steel spur and motor gears to stabilise torque transfer without altering the chassis geometry.
The aim is straightforward: keep the low centre of gravity via aluminium construction while upgrading to hardened 32-pitch steel gears to improve wear resistance and repeatable mesh. The kit contains a 54T steel spur and a 17T steel motor gear, offering a single defined gear pairing compatible with the Slash 4X4 68086-21 configuration.
Use these driven ratio references when choosing pinions: 54T with 15T = 1:3.600, 54T with 16T = 1:3.375, 54T with 17T = 1:3.176, 54T with 18T = 1:3.000, 54T with 19T = 1:2.842, 54T with 20T = 1:2.700. The included 17T pinion strikes a compromise between strong acceleration and useful top speed for everyday Slash use.
Install this set when you want the robustness of steel gears while keeping the handling benefit of a low-CG aluminium adapter on a Slash 4X4 laid out for the 68086-21 variant; the upgrade focuses on driveline repeatability rather than changing chassis feel.
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