This is a Hop-Up Option is for use with the TD4 chassis. The rigid aluminum differential nut allows precise adjustment of ball differentials used on the kit. A precision differential screw is included.

• This durable aluminum differential nut (blue) and precision differential screw can be used in place of the kit standard plastic nut for superior precision.
• Comes with the differential spring, thrust plate, and 1/16-inch steel balls.
• Compatible with TD4 chassis cars.