One of the manual transmissions would be the Wilson pre-selector, launched in 1930 applied for a planetary equipment process to preselect equipment ratios by running a small lever about the steering area.  Asap hitam sebab injektor kotor,plug yang cepat hitam,air filter kotor dan minyak hitam yang naik sehingga silinder head. https://gearboxauto64296.blogaritma.com/32101015/gearbox-auto-no-further-a-mystery