The Volvo 240 and 260 can have 12 types of transmissions: the first 240 had a M40 4-speed gearbox or M41 4-speed manual transmission with electronic overdrive. These were replaced by the M45 4-speed manual gearbox (also available als M45WR with wide range ratios, but very rare) and M46 4-speed manual gearbox with overdrive. The M47 is a manual 5-speed gearbox. The Volvo 260 was also available with M50 4-speed and M51 5-speed gearbox. For the automatic gearboxes there were several versions: the BW35 automatic transmission, which was replaced later by the BW55 and AW55 three-speed automatic gearbox. The AW70 and AW71 gearboxes are three-speed gearboxes with build-in automatic overdrive.