* Automatic Transmission: The transmission fluid dipstick and fill tube are usually located on the top of the transmission itself. You'll likely find it near the back of the engine compartment, on the passenger side (right side when sitting in the driver's seat). It's often a dipstick with a cap on top. The dipstick will have markings to show the fluid level.
* Manual Transmission: Manual transmissions don't have a dipstick or fill cap in the same sense as automatics. They generally use a specific fill plug on the side of the transmission case, and the fluid level is checked by removing the fill plug and observing the fluid level. The location of this plug is specific to the car's transmission type.
To find it definitively:
1. Consult your owner's manual: This is the best resource. It will show you exactly where the transmission fluid dipstick/fill plug is located.
2. Look under the hood: Carefully examine the top of the transmission, which is the large metal casing behind the engine. Look for a dipstick with a cap, or a plug that might have markings that indicate it's for transmission fluid.
3. Use a Haynes or Chilton repair manual: These manuals have diagrams and detailed instructions specific to your car model.
Important Note: Be cautious when working under the hood. Let the engine cool down completely before checking the transmission fluid.