To find out what transmission you have:
* Check your owner's manual: This is the most reliable source. The manual will specify the transmission type and fluid capacity.
* Look at the transmission itself: The transmission casing usually has an identification tag with a code that indicates the transmission type.
* Check your vehicle's identification number (VIN): You can use this number with online VIN decoders (many are available for free) to determine the original equipment.
Once you know the transmission type (e.g., 4L60E, 700R4, etc.), you can search online (e.g., using Google) for the specific fluid capacity for that transmission in a 1994 Chevy 1500. You will find this information on automotive repair sites and forums.
Do not attempt to add transmission fluid without knowing the correct type and capacity. Using the wrong fluid or adding too much can severely damage your transmission.