What automatic transmission came in a 98 Chevy Silverado c1500 2wd pick-up?

The 1998 Chevy Silverado C1500 2WD could have come with either the 4L60E or the 4L65E automatic transmission. The difference is largely in torque capacity; the 4L65E is slightly stronger. To know for sure which one was in a *specific* truck, you'd need to check the vehicle's documentation or the transmission itself.