Powerhd wh-30kg servo. Only ran the car maybe for an 1hr total with no jumps. It took one very light tumble in the grass that did not even leave a scratch. Servo seems to work ok but was weak from the beginning. Steering is very smooth without the servo connected so nothing is binding. It makes a clicking sound when turning it by hand I noticed when removing it to replace it with a more powerful servo. Live and learn I guess. Probably not worth sending it in for repair.