CNC-machined 50mm ECS drive shaft produced from world-renowned HUDY Spring Steel. This race-quality drive shaft is an extra part for #305331 Equalized Corner Speed (ECS) Drive Shaft 50mm - HUDY Spring metal (1), exclusively manufactured by HUDY. Drive shaft diff end has been strategically lightened to cut back rotating mass without compromising strength. The drive shaft is updated with a stronger 2mm pin for increased durability and dependability.