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Dynatrac ProRock 60 Axle & Brake Kit - Dynastout

Posted in How To: Transmission Drivetrain on April 1, 2009
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This is Dynatrac's ProRock 60 complete with stub hubs, big-brake upgrade, and Dynaloc locking hubs. This axle now resides under the front of our project Teal Brute. After six months of real-world testing--scratch that; thrashing--we're giving it the official stamp of approval.

Stopping a rig with 40-inch rubber and 5,800 pounds of metal isn't easy, especially when you're sailing along at speed through sand dunes with a buddy, listening to music, and having a great time. That's exactly why we always try to preach the benefits of bigger brakes in our articles. However, larger brakes are only effective if the driver reacts in time to avoid whatever dangers lurk ahead. For those other instances, only the stoutness of your drivetrain componentry will tell how much fun the day has in store for you. In most cases, the axles are where abuse rears its ugly head first. So, axle stoutness is of utmost importance. Enter Dynatrac, with its new Stub Hub conversion and the tough-as-nails Dynaloc lockout hubs. Try as we may, these parts are simply too overbuilt for our Hemi-powered Teal Brute project rig to break, even when one unnamed lunatic took a horrifying line over the edge of a dune at speed. The results weren't good to some of the lesser parts on the rig, but for Dynatrac's latest offerings, let's just say "game on." We just hope that next time Mr. Lunatic gets behind the wheel, a little more common sense (and braking) is applied before going airborne.

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Here you can see the difference between Dynatrac's Stub Hubs and the traditional style hubs. At first we thought the shorter spacing between each of the supportive axle bearings was too little to hold up to severe impacts like jump landings. After six months of abusive testing in the Brute, we're convinced otherwise. The Stub Hub conversion provides an additional 4 3/4 inches of clearance over the traditional arrangement, perfect for tight conditions where rock damage can get expensive.

PhotosView Slideshow

7. We used Stage 8's X-Lock locking spindle nuts with our ProRock 60 front axle because one stout product always deserves another. The Stage 8 fasteners are much better at maintaining bearing preload over traditional-style locking spindle nuts. Each component of this system is laser cut from 4130 steel for a perfect fit. Additionally, the heart of this system, the threaded Stage 8 nut, is CNC-machined to exact tolerances. A snap ring fits into a groove on this nut, keeping the whole arrangement locked in place. Once installed, the system is capable of withstanding severe reverse torque, so you don't have to worry about spindle nuts loosening again.

8. For increased bearing life, always torque the spindle nuts enough to ensure that no excessive play is present. Then back the nut off ever so slightly to achieve the proper bearing preload. Once properly torqued, you can double-check the preload by simply grabbing the rotor with your hand and spinning it. When appropriately torqued, the rotor should spin to a stop within half a rotation. This important step will ensure the bearings wear evenly, providing long service life.


Huntington Beach, CA 92647
Stage 8
San Rafael, CA 94901

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