The Traxxas 8251 outer portal drive housings are genuine replacement parts designed to maintain the strength and reliability of the portal axle system on your RC truck. These housings protect the internal portal gears while providing a secure mounting point for the outer axle components, helping ensure smooth power transfer and consistent performance during demanding off-road driving. Made from durable composite material, they are built to withstand rough terrain, impacts, and heavy use. This set includes two outer portal drive housings and installs easily as a direct factory replacement. Compatible with Traxxas TRX-4 and TRX-6 RC vehicles.