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Originally Posted by Nimisys
ALL 4l80E require a TCM to function. thats what the E stands for, Electronic. Not all TCM's have to be made by GM though to function correctly. BUT you still must have a TCM.
currently market prices put a running 4l80e setup at over 2grand to implement, with a used tranny.
they did add a 4th direct clutch on top of the th400 to produce an overdrive gear. they are similar, but built beefier. they weigh in close to 225lbs dry.
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I seen these 4L80E transmissions used in tractor pull rigs before.
http://www.transmissioncenter.net/4L80E.htm
Also seen a 4L80E trans built by Hughes Performance (I think) without the electronics used in a 71 Chevelle and I got to look at that car on a lift. It looked like the 4L80E and there wasn't a computer with it either. Definitely no harness and no electrical at all except for the speedo gear output.
I'm not real sure how they get around the electronics. If it's just a fully manual valve body or how they do it. And they aren't cheap either.