Volkswagen has used 10 different types of automatic and manual transmissions in its vehicles since the 1970s. The identification code is typically found on the bottom of the transmission.
Volkswagen equipped its cars with four and five-speed manuals until 1993. These were designed to fit more than two dozen different gasoline and diesel engines. “ACH” was stamped on “020” five-speed manuals in the 1985, 1.6-liter, diesel-powered VWs.
The six-speed manual was standard equipment on Beetles and Golfs beginning in 2002. An “02M” six-speed, for example, featured “FML” stamped on the transmission for 2002 to 2005 Beetles.