I'm under the impression that the only difference is the torque converter ie stall speed anything else I need to know. Found a brand new 4l80e on craigslist that was bought from a dealer and is still in the crate $900.
I think there the same, just 2x4 and 4x4 versions and updates over the years. IIRC the 454 ran the same converter, which makes sense because they both build peak torque around the same rpm.