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The 2004 Chevy TrailBlazer requires Dexron III Automatic transmission fluid. Although transmission fluid can be costly, the good news is that you don't need to replace it frequently. The manual advises checking and changing the fluid and filter every 50,000 miles if you drive in heavy city traffic, hot temperatures of 90 degrees Fahrenheit, mountainous terrain, hilly areas, or if you tow trailers often. If none of these conditions apply, it's safe to wait until 100,000 miles before changing the fluid. This, along with regular engine oil changes, is essential vehicle maintenance.
A 2004 Chevrolet Trailblazer needs ATF Type III-H fluid for its transmission.
The type of transmission fluid recommended for a 2004 Chevy Trailblazer is Valvoline synthetic transmission fluid in a one-quart size, which costs $9.99.