What is the proper method to check the Transmission Fluid?

Using the dipstick is the proper method to check the transmission fluid because it allows for an accurate assessment of the fluid level and condition. The dipstick provides a means to visually gauge the fluid's level against marked indicators, ensuring that it is within the optimal range for proper operation of the transmission. Additionally, it can help identify the condition of the fluid, such as clarity and odor, which can indicate potential issues.

While visual inspection can give a general idea about the fluid condition, it lacks the precision and reliability of using a dipstick. Checking the temperature gauge is not a direct method for assessing fluid levels, although fluid temperature is important for operation. Consulting the manual can provide guidelines and procedures for checking transmission fluid, but it does not replace the physical act of measuring the fluid level with a dipstick for immediate information.