4l60 is a newer transmission based on the 700R4, the 4L60E is the electronic version. The newer 4L60E's that came with LSx had a separate bell housing, which may cause slight fitment issues, but many here have used then in 1st Gen cars.
The 4L80E is a different animal all together.. larger, but also a lot more durable. It's traces it linage back to the TH-400.
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