actually, if you lay the planets for both of those side by side, you will find that the 700/4l60 planets have physically bigger gears --- but the apply components for the 400/4l80 are bigger ---- plus the 4l80e does have the EXTRA planet in front for overdrive as stated above, so it doesn't mind if you tow in overdrive. The 700/4l60 uses the rear planet for overdrive, and if overloaded, will overheat and turn pretty colors of blue/purple/black as they are melting away......
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