* 4R55E (4-speed automatic): This was the most common transmission in the 1998 Explorer.
* 5R55E (5-speed automatic): Less common, but some higher-trim levels or models with specific engine options might have had this 5-speed automatic transmission.
To know for certain which transmission is in a *specific* 1998 Ford Explorer, you'd need to check the vehicle's identification number (VIN) or look at the transmission itself (though this requires some mechanical knowledge). The information is also often found on the vehicle's sticker, usually located in the driver's side doorjamb.
