Traxxas Brass Portal Housing Weight 34g RC Car Part (2) - 8267 Dive Bomber If your existing idler gear

If your existing idler gear is worn

Upper right rear suspension arm

The Koswork Mini Black V2 Aluminum Carry Case (w/Futaba 10PX/4PM/7PX/7PXR foam) (KOS32302-10PX) is a tool / accessory that helps you build

1 x Kyosho W6033V 64 DP 33-tooth velvet coated pinion gear

Basic screwdriver or prop tool appropriate for your ZZR/ZZR2 to complete the swap

Traxxas Brass Portal Housing Weight 34g RC Car Part (2) - 8267 Dive Bomber If your existing idler gearThe Traxxas TRX8267 brass portal housing weights are a set of two 34 gram brass inserts designed to add low, centralised weight to the portal axle housings on Traxxas TRX 4 and TRX 6 crawlers. Fitting directly into the portal housings, these brass weights lower the centre of gravity and increase axle weight without requiring any modification to the chassis. For serious scale crawling, adding brass is one of the most effective ways to improve traction