The fluid channels open above the front pinion bearing. The upper fluid channel is visible in the casting at the top of the Iron Jock housing.
With its cast ductile iron manufacture, the new Iron Jock weighs in at just 60 pounds (compared to the 26 pounds of the aluminum Rock Jock). Like its aluminum brethren, it uses a flow-through circulating oil system and a 60-degree cover angle to maximize ground clearance. The two-way oiling system features return passages around the pinion area so fluid can circulate around the pinion bearing without becoming trapped. Each unit also includes a Jock Strap skidplate made from AR400 heat-treated, abrasion-resistant material that creates a smooth surface for rocks and other obstacles to glide over. Even with the angled cover, the Iron Jock can use standard Dana 60 diff covers or an aluminum Rock Jock cover. A good degree of structural webbing is also in place to ensure that the Iron Jock housing will hold up to maximum torque output.
Oversized bearing caps are employed to positively secure the carrier bearings.
The Iron Jock can be equipped with 3-inch-diameter, 3/8-inch-wall or 3-1/4-inch-diameter, 1/4-inch-wall axletubes. Tubes can be pressed in and also bolted through the six predrilled holes in the casting. The top of the centersection features threaded bosses cast into the case for suspension bracket mounting. A universal bridge bracket is available from Currie to accommodate a variety of suspension types. The Iron Jock uses reverse-cut Dana 60 ring-and-pinion gears along with an oversized pinion bearing and bearing caps. Typical Dana 60 applications use a smaller front pinion bearing than they do in the rear, but the Iron Jock employs use of the larger bearings at both the front and rear of pinion. The Iron Jock can also accommodate pinion angles up to 20 degrees.
Since we were yet unsure of our desired axle width, we had Currie Enterprises press in longer axletubes than we'll likely need. This will enable us to more precisely position the front and rear pinion angles rather than simply guessing, and will also aid in achieving an acceptable axle width that will best accommodate our custom suspension setup. | 
The first two Iron Jock Dana 60R axlehousings as they'll sit beneath our Scout II project rig. | 
The Iron Jock's 60-degree cover angle and increased ground clearance are both evident in this image. Currie offers units available to accept either 3x3/8- or 3-1/4x1/4-inch-wall axletubes. |