The SLA155613TLG upgrade combines a low-CG aluminium adapter with hardened 32 pitch steel gears specifically for the TRAXXAS SLASH 4X4 (68086-21 version). The lowered adapter position moves the spur closer to the chassis datum and the steel spur and pinion help preserve a consistent mesh under load.
Calculated drive ratios using the supplied gear combination are as follows: 56T with 13T = 1:4.307, 56T with 14T = 1:4.000, 56T with 15T = 1:3.733, 56T with 16T = 1:3.500, 56T with 17T = 1:3.294, 56T with 18T = 1:3.111, 56T with 19T = 1:2.947, 56T with 20T = 1:2.800.
The aluminium adapter plus steel spur and motor gear is presented as a means to steady power transfer and improve consistency of tooth engagement compared with softer alternatives, useful for tuning final drive toward either stronger acceleration or higher top speed on Slash 4x4 rigs.
Assembly advice: confirm pinion alignment, establish mesh with a full-thickness pattern method, and ensure chassis clearance before tightening. Use appropriate thread-lock and correct torque values for mounting screws and check motor shaft fitment with the pinion adapter prior to running.
This direct-fit aftermarket gear set and adapter is aimed at Slash 4x4 users wanting a steel spur assembly with a low-CG aluminium adapter to refine drivetrain behaviour and gearing choices.
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