The new 4-Speed Atlas has a higher input torque rating and is more reliable than the old unit. And while it has grown in length, it is still shorter than an NP231 and about the same length as an NP231 with a slip yoke eliminator. There are lots of options for gearing, but we aren’t fans of stupid-low gears. One of the reasons we went with this ’case was to allow us to wheel anywhere we wanted, so we went with the 1:1; 2:1; 2.72:1, and 5.44:1 gears. The 2.72:1 is the planetary with 2:1 inside the case, and both ranges engaged at the same time give us 5.44:1. We can do anything from huge rocks to bottomless mud to sand dunes.