Where do you add transmission fluid to a manual on 2000 Ford Ranger truck?

The transmission fluid filler plug for a manual transmission on a 2000 Ford Ranger truck is located on the side of the transmission housing, usually towards the top. It is typically marked with a "MT" or "Manual" label, and is often a 17mm hex head plug. To add transmission fluid, simply unscrew the filler plug and use a funnel to pour in the fluid until it begins to overflow from the filler hole. Be sure to use the type of transmission fluid specified in your owner's manual, and do not overfill the transmission, as this can cause damage.