The 4l60e transmission contains 4 gears which are 3.06, 1.63, 1, and 0.7 gears.
There's also the reverse gear which is 2.29 so actually the 4l60e has 5 gears including the reverse gears along with the forward gears.
The forward gear 3.06 is the low gear in the transmission and provides the vehicle with strong high performance at low vehicle speed.
While the 0.7 gear which is the top gear in the 4l60e transmission provides significant overdrive as well as fuel economy benefits.