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Originally Posted by lt1s10
In most of the 4L80E versions shifting is computer controlled. If he doesn't have a computer controlled engine that can also control the trans then it's probably more work then it's worth to swap in the 4L80E. They also sell stand alone ecu's for just the trans but they are pricy. The 4L80E is common in the heavy duty GM trucks and also in the motorhome and utility chasis kits that GM sells. There are non computer controlled versions of the 4L80E but they are not very common at least where I am.
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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.