4l80E?
1) HEAVY
2) Expensive
3) Don't believe factory electronics will control it
4) Not as strong as you might believe (I think this related mainly to the OD unit - and some of the new parts from the electric "conversion")
I don't really know anyone running one of thase, mainly because of #1 and #2 above - I know George baxter considered, but then ended up nixing the idea.
chris

