TRAXXAS Rustler 4X4 VXL Medium Carbon Steel Center Differential Kit by GPM FR1200S  [FR1200S]

Center differential upgrade for 1/10 4WD

This GPM FR1200S center differential kit is an aftermarket, RC-scale replacement designed for TRAXXAS 1/10 4WD platforms specified below. The kit replaces the stock limited-slip center diff with a heavier-duty unit that uses a 7075 aluminum differential housing combined with medium carbon steel output gears to improve drivetrain durability under 3S LiPo power.

The assembly transfers torque to all four wheels while reducing reverse driveline stress on the transmission shaft. It is delivered as a center differential kit that includes multiple internal parts referenced in the original part list, and it requires the user to add differential silicone oil to tune torque split and lock characteristics for on‑track behaviour.

This kit is suited for hobbyists looking to replace the factory limited-slip center differential with a more robust, serviceable RC-scale unit. Retain the user-supplied differential silicone oil to adjust lock and split behavior, and pair the included 54T medium carbon steel spur gear as noted with a compatible 32P pinion/spur setup when required.