I hear you, but two things to consider: 1/ 6L80 is a completely different beast. It's based on a ZF design, not an organic GM design and is a clutch-to-clutch transmission (no bands) so it's more complicated. 2/ There are hard parts inside that were faulty in the original design and/or manufacture that if reused won't last. These hard parts would cost most of that $1850 to buy wholesale, so that price won't get you those hard parts. All you're gonna get for that money is R&R, a minor repair, and a fresh coat of paint. In the oilfield, we called that a Krylon overhaul.
I've rebuilt two of my own transmissions on my bench. The first was a ZF 5HP24 out of a BMW 740iL and now an Aisin-Warner unit out of a Land Rover LR2. I start by researching which parts have been superseded with newer designs by either the original manufacturer or the aftermarket and only the updated parts go in.
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