* 4L60E: This is the most common automatic transmission for this vehicle and year.
* 4L80E: Less common, but possible, especially if it was a heavier-duty option or had a towing package. The 4L80E is a heavier-duty transmission.
To know for sure, you'd need to check the vehicle's documentation (owner's manual, build sheet if available) or look at the transmission itself for identification markings.
