Side-by-side charts of 4L60E and 4L80E ratios in technical guides show that both share a similar overdrive range, so highway rpm is more a function of axle ratio and tire size than which of the two ...

With their debut in the 1990s, GM's 4L60E and 4L80E transmissions reveal some of their differences –- and similarities –- right in their names. The "4" and "L" respectively refer to the number of ...