The outer protal Drive housing provides more precision for the portal drive transmission gears and adds more low weight to the truck to improve the crawling performance of your TRX-4

ST Racing Concepts have been making high quality CNC Machined option parts for various R/C vehicles for over 15 years.  Great fit and precision with each and every part.  These products are in stock and ready to ship from California (No need to wait on oversea shipping like with other brands) Thanks for looking