stamped in a pad just above the starter flange. This transmission was available in several gear ratios for different engines and vehicles, so it's important to get a transmission with the same code or another code known to be the same gear ratios. If the gear ratios are not the same the transmission controller will assume the transmission is slipping and go into fail safe mode. Rebuilding The 01M transmission is a specialized transmission used only on Volkswagen vehicles, although very similar to the ones used on Renault vehicles. As a result, most local transmission shops or national chains won't have specific training, knowledge and equipment to test and re-machine vital parts of this transmission. This may result in several teardowns under warranty to get an acceptable result, if possible at all. Checking and filling oil levels The correct fluid is a synthetic mineral oil, such as Pentosin ATF-1, Mercon V or Volkswagen G 052 162 A2. 3.750 liters is usually sufficient for a filter change. The transmission fluid is checked from underneath the vehicle while running and the transmission in park. This must be completed before the transmission fully warms up (35-38°C). Once running, the drain plug on the bottom of the transmission oil pan is removed with a 5mm allen wrench. Some fluid will drip out whether oil level is full or low. There is a plastic stack in the hole, similar to a chimney, which keeps all the fluid from running out. This stack maintains the proper level at the proper temperature. If the fluid is "glugging" or just barely running out the bottom hole when the temperature of the transmission is in the range of 95F-113F, no further action is needed. Reinstall drain plug and put fill cap back on. If no fluid comes out, fill the transmission with specified fluid a little at a time until fluid is observed "glugging" or just barely running out the hole in the bottom. No further action is needed. Install drain plug and fill tube cap. This transmission has a separate oil for the differential in the transmission, so there are two fluid levels to check. The differential fluid is checked by unscrewing the speed sensor gear assembly and use it as a dipstick. The speed sensor gear assembly is located on top of the transmission just above the right inner CV joint. Differential is emptied by removing the