Among the many other changes they bring to a truck’s powertrain, battery electric trucks certainly don’t have the 18-speed transmissions we’re used to. Forget the switch from manual to automated manual—this is a much bigger change. So what does this mean for truck transmissions?

Eaton, for one, has been focused on four-speed transmissions for both medium-duty and heavy-duty trucks. Wondering why four-speeds, and what all of these changes mean for truck transmissions, I stopped by their booth at ACT Expo to ask them these questions.

Watch the video above for more.