Transmission failure can generate unconventional noises even if the vehicle is in neutral. These sounds could possibly signal small transmission fluid amounts or mechanical don and tear over the transmission components. Dutch carmaker DAF popularised the CVT with its range of town autos while in the 1960s and 1970s https://franciscorvusp.yomoblog.com/38796277/the-basic-principles-of-gearbox-cvt