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Dynatrac JK Axle Under a Fullsize Truck
In the May 2011 issue, we decided to build the ultimate Dynatrac ProRock JK Axle almost 10 inches wider than a standard JK axle and then throw it under an overly-abused fullsize truck.
Our red Dodge, Jinxy, ended up being the perfect test platform due to the prerunning and trail-running, and other varieties of off-road annihilations this truck goes through. We dropped the axle under the truck right before a much-anticipated northward road trip that would wind us through the western United States and eventually into northern Idaho. During the trip we put more than 2,000 miles on the truck, including lots of off-road miles in rocks, mud, and snow.
We’re pleased (but not surprised) to say that this axle assembly has held up excellently. The 3-inch-diameter axle tubes are still perfectly straight after multiple airborne jaunts, even though there is no trussing on this axle. The Reid racing knuckles still look brand new, and the ProSteer balljoints are still tight. We’ve had no problems with the 35-spline RCV axles as well, and are especially pleased with the zero binding at full turn lock in 4WD (thanks to the constant velocity joints).
All in all, we couldn’t be happier with our Dynatrac ProRock JK axle. It’s held up beautifully, hasn’t bent, and weighs less than a Dana 60 while being almost as strong.
We’ve run full-floating 10.5-inch 14-Bolt axles on stock trucks, on modified high-horsepower prerunners, in trail rigs, in 4x4s with 47-inch tires, and in the most heavy-duty of tow trucks. Honestly, we have yet to see a single problem come from this axle...and we’re not sure we can say that about any other axle model that we’ve laid hands on. We mean it; nothing. Not even an axle seal leak. And the most modified version we’ve ever run is with an ARB air locker and 5.13 gears. Even in stock form, these axles are so hardcore that they are said to be as mechanically strong as a 2.5-ton Rockwell axle.
The only problem we have found with this axle is the lower lip that inhibits ground clearance if you’re running less than a 37-inch tire off-road.