hey guys is it normal for the motor to have a certian amount of whine at high rpm's. My AMD fb4001 get's singin perty good at about 4-5 k ?( about 25-30mph in first gear, 120v) I do like the decreased draw at the higher rpm's and was demonstrating it to my wife who said " is that hurting to motor". I didn't think so but thought that I'd check. the driveline, otherwise is smooth, no grinding or binding noticed.