This upgrade kit replaces the stock plastic interface on TRAXXAS SLASH 4X4 rigs that use the 68086-21 version, supplying a low-CG aluminium adapter matched to hardened steel 32 pitch gears for steadier torque transfer during aggressive runs.
The aluminium adapter cuts flex around the mounting area while the hardened steel 56T spur and 18T motor gear reduce wear compared with plastic components, delivering more consistent engagement under heavy acceleration and repeated high-load use on mixed-terrain sessions.
Swapping the pinion changes final drive ratios so you can tune acceleration against top speed; the set includes a 56T spur and works with typical 32 pitch pinion sizes, with example ratios shown below.
Choose this set when you need a more durable steel-tooth drive and a firmer, lower mount for steadier drivetrain response while experimenting with gearing for different surfaces.
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