* 4L60E: This 4-speed automatic transmission was very common in this model year.
* 4R70W: Less common, but possible, especially if it had a V8 engine and specific options. This is also a 4-speed automatic.
To know for certain which transmission is in *your* specific 1998 Chevy Silverado 1500 WT, you need to:
* Check the vehicle's documentation: The owner's manual or build sheet (if you have it) will specify the transmission.
* Look at the transmission itself: The transmission case will usually have an identification tag with a code indicating the transmission type. This might require getting under the truck for a clear look.
* Check the vehicle identification number (VIN): A dealer or online VIN decoder can usually determine the original specifications, including the transmission.
Don't rely on generalizations; the only way to know for sure is to check the vehicle itself or its documentation.
