* 4-Speed Automatic: Typically holds around 10-12 quarts. However, a complete drain and fill might only use around 4-6 quarts at a time to avoid overfilling. You should *always* consult your owner's manual for the exact capacity.
* 700R4 Automatic: This transmission also holds around 10-12 quarts, again with a similar caveat about drain and fill procedures. Check your owner's manual.
Crucially: The best and most reliable information will be found in your owner's manual. It will specify the exact capacity for your particular Blazer's transmission. Don't rely on internet estimates – incorrect amounts can damage your transmission.
