Our rear axle is the well-known Dynatrac Pro-rock 60. With tires over 36 inches, we would be pushing the limits of the stock rear axle, and the high-pinion Pro-rock should have no problems whatsoever with our lightweight Tacoma. Of course, the Pro-rock will add some weight, but hopefully in the right areas. We had the housing machined and added a differential bridge to give another option for mounting the rear suspension links. Next month we'll show you how these axles will fit under our Ultimate Taco.