1. Top is a ProRock 44 housing, bottom left is a ProRock 60 housing, and bottom right is a ProRock 80 housing. You can see right from the beginning this is a no-nonsense proposition. And, with Dynatrac’s high-clearance design we will lose barely an inch of ground clearance as compared to a ProRock 60. That junkyard Dana 60 you are eyeballing? This ProRock 60 gives up only 5⁄16-inch of ground clearance on that axle.