Compared to the out of the box chassis, it improves TT01 stability, allowing it to run smoother on different surfaces. The aluminum upper arm set is equipped with adjustable camber which enhances the response of Tamiya TT01 and allows for sharp turns. All in all, Yeah Racing TT01 conversion kit (upgrade version) includes everything you need to upgrade from the original TT01 to a competitive racing RC chassis. Note: Only blue highlighted parts in photos included. For: Tamiya TT01 or TT01E. Aluminum Front Lower Arm Set TATT-035 (1pc). Aluminum Front Steering Knuckle Set TATT-037 (1pc). Aluminum Rear Lower Arm Set Blue TATT-038 (1pc). Aluminum Rear Hub Set TATT-040 (1pc). Aluminum Steering Set TATT-042 (1pc). G45 Steel Front or Rear Diff Outdrive TATT-046 (2pc). Aluminum Universal Shaft TATT-047 (2pc).