On a 2000 Lincoln Town Car : Using a funnel you add automatic transmission fluid through the dipstick tube The tube is located near the firewall , at the rear of the engine ( front of transmission ) on the passenger side of the engine in the engine compartment
When the level gets to the add mark. Usually the add mark will require 1 pint of fluid. Never ever overfill the transmission with fluid. Check the level according to instructions in your owners manual. If you have to add fluid, then you have a leak.
Assuming that you are referring to an automatic transmission- the only place to add fluid is through the transmission dipstick tube. Just be sure that your fluid is low before you add, because there may not be a drain plug (some had them, some didn't).
Transmission fluid is added to most vehicles in the same place that you check the fluid level. Pull the transmission fluid dipstick, insert a long funnel in the tube and add fluid there. Remember transmission fluid is added by the pint not quarts.
The transmission fluid can only be added/changed by a dealer or someone with the proper tools to check the fluid level. There is no dipstick for the transmission. I have 89000 km on my LS & am wondering at what mileage to get the fluid changed.