The STaK engineers said the hardest puzzle of this project was the shifters. The goal was three shifters that come through the stock floor openings of a Jeep, didn't rattle, and are easily shifted. The version we saw had the rear-most lever activating the rear axle in either High Neutral or Low, and the middle lever activates the same for the front axle. Then the front-most lever chooses between 3.05:1, Neutral, or 5.44:1 low ranges. We found the shifting a bit confusing and tight, but a revised system is in the works as well as possible pneumatic or solenoid shifters that wouldn't even require levers if the customer requests it.