To find your transmission type, check:
* Your owner's manual: This is the most reliable source.
* The transmission itself: The transmission usually has a code or number cast into it. You may need a flashlight and possibly to get under the truck for this.
* Your vehicle identification number (VIN): A dealer or online VIN decoder can tell you the transmission type.
Once you know the transmission type (e.g., 4L60E, 4L80E), you can then search online for the specific fluid capacity for that transmission in a 1999 Silverado 1500. Remember to always use the correct type of transmission fluid specified for your transmission.