4. But the beef doesn’t stop there. The ProRock 80 was designed to carry some weight, so even the housing ends are beefier. To the left is a Dana 80 housing end. The housing ends have a bigger ID to allow the bigger axleshafts to pass through and the bearings that go into these axles make Dana 60 parts look silly by comparison. To the right is a ProRock 60 housing end. Both parts are designed and built by Dynatrac right here in the USA.