The rest of the axels on the vehicle are nearly the same as the front steer axels, with a few differences. What are the differences?

There are FOUR differences between the steering axle, and the tractor and trailer axels. They are the Torsion bar, the space between the axels so bud rims or spacers, tread depth changes from four-thirty seconds to two-thirty seconds, and retreads are allowed on every axel but the steering axel, and the portion of the airbag of the suspension.