The front Ultimate Dana 60 axles are beefy and give you a lot of cool aftermarket parts for your money. A high-clearance ribbed housing and a nodular iron diff cover give the axle a unique look, but below that black paint is where the real strength begins. First, a 10-inch ring gear is larger than the standard Dana 60. Second, compared to a standard old-school 1-ton 35-spline Dana 60 shaft, the chromoly axleshafts in an Ultimate Dana 60 (top and left) are massive by comparison. The inner shaft doesn’t neck down like the stock Dana 60 shaft, and the UD60’s monster SPL-70 U-joint absolutely dwarfs the older U-joint.