* 4L60E: A four-speed automatic transmission. This was very common in many 1998 Suburbans.
* 4L80E: A four-speed automatic transmission, typically found in models with larger engines or heavier-duty configurations.
To know for sure which transmission is in a *specific* 1998 Chevy Suburban, you need to check the vehicle's identification number (VIN) or look at the transmission itself (though identifying the transmission type requires some familiarity with transmission markings).