Where is the transmission fill plug on a 1989 Toyota pickup?

On a 1989 Toyota pickup, the transmission fill plug is typically located on the side of the transmission case. It is a hexagonal or square-shaped plug that can be accessed from the driver's side of the vehicle. To fill the transmission, you would remove this plug and add the appropriate Transmission Fluid until it reaches the correct level. Always ensure the vehicle is on a level surface when checking or filling the transmission fluid.