* 4L60E: This 4-speed automatic overdrive transmission was very common in many GM vehicles of that era. This is the most likely candidate.
* 4L80E: A heavier-duty 4-speed automatic overdrive transmission. More likely to be found in Suburbans with larger engines or higher towing capacities.
To know for sure which transmission is in *your* specific 1996 Suburban 4x4, you'll need to:
* Check the vehicle's identification number (VIN): A VIN decoder (many are available online) can provide detailed specifications including the transmission type.
* Look at the transmission itself: The transmission case usually has identifying numbers stamped or cast onto it. However, this requires getting under the vehicle, and identifying the numbers can be tricky.
* Check the owner's manual: If you still have the original owner's manual, it will specify the transmission.
The 4L60E is the more probable answer, but verifying using one of the methods above is the only way to be certain.
