Sisu was among the first to use 5-speed gearbox with overdrive. During the Second World War produced Sisu S-21 featured ZF gearboxes, which were later, in the Yhteissisu produced units, substituted by domestically produced Rosenlew products. The non-synchronised Fuller was the leading transmission type until the 1990s when the synchronised ZF and Renault gearboxes became more popular. When Sisu Auto started component partnership with Mercedes-Benz, the MB Telligent and PowerShift gearboxes came to selection, the non-synchronised Fuller still remaining as an option.