To find the correct capacity, you need to:
1. Identify your transmission: Look for a tag on the transmission case. This tag will have a code that identifies the specific transmission.
2. Consult a repair manual: Once you have the transmission code, consult a repair manual specific to your 1988 Chevy S10. A Haynes or Chilton manual will list the fluid capacity for each transmission type.
3. Check your owner's manual (if you have it): Your owner's manual *might* list the capacity, but often it's only a general range or doesn't specify for each transmission option.
Without knowing the transmission type, providing a specific fluid capacity is impossible and could lead to incorrect filling and damage to the transmission.