What kind of transmission fluid goes into a 1984 gm sierra pick up?

A 1984 GMC Sierra pickup truck likely used Type F automatic transmission fluid if it has an automatic transmission. However, it's crucial to verify this. The specific type of fluid depends on the exact transmission installed in your truck. The owner's manual is the best source for this information.

If you don't have the owner's manual, look for a tag on the transmission itself, or check the transmission's identification number. You can then search online (or consult a parts store) for the correct fluid specification using that information. Using the wrong fluid can severely damage your transmission.