So I finally found an answer to one of my questions today. What is the difference between the 6R60, 6R75, and 6R80? Well, none. The physical internals and gear ratios are the same between all 3 transmissions from accounts I’ve read. The only difference is what size torque converter was installed at the factory and when it produced peak torque multiplication it seems. They differed the converter for mid size to full size. Mid size autos used the 6R60 and full size autos used the 6R75 and later the 6R80.
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