The front axle tubes are big 3 1/2-inch-diameter, 0.370-wall material and house 35-spline inner and outer axle shaft with huge Dana 70-sized U-joints.

A Dana 70 can have a weight rating of up to 10,000 pounds, but 8,000 pounds is much more common. A 14-bolt can have up to an 8,600-pound GAWR. The greater the load-carrying capacity of the axle ...

The expanded center allows it to run at higher speeds for a given length while offering increased strength and up to a 5% reduction in weight over straight aluminum tube driveshaft designs, Dana said.