Chassis 7075 4mm Hard Anodized Lightened NT48.3 made by Tekno RC TKR5407 Chassis (7075, 4mm, hard anodized, lightened, NT48.3) - This is the stock chassis for the NT48.3. It is also a direct replacement for the original NT48 chassis. The rear engine option has been removed and the flex characteristics enhanced to greatly increase the spur gear durability.