The amount of transmission fluid needed for a 1998 Chevy Blazer depends on the type of transmission it has. There were several options available for that year. You
must check your owner's manual to find the exact capacity for your specific Blazer's transmission.
Trying to determine the amount without knowing the transmission type (e.g., 4L60E, 700R4) will result in an inaccurate answer and could potentially damage your transmission.