Crane Axle Magnum Knuckle Aluminum Unit Bearing Adapter – 2005+ Super Duty (Pair)
CA01035A
The Crane Axle Magnum Knuckle Aluminum Unit Bearing Adapter is engineered to integrate 2005+ Ford Super Duty unit bearings with the Crane Axle Magnum Outer Knuckle System for high-strength off-road steering axle builds. Designed for rock crawling, Ultra4 racing, and custom fabricated axle applications, this precision-machined adapter combines the compact packaging and low-maintenance serviceability of modern unit bearings with the extreme lateral strength required for large tires, high horsepower, and aggressive steering loads.
Machined from lightweight aluminum to reduce unsprung weight, this adapter simplifies wheel-end maintenance compared to traditional spindle and wheel-bearing setups. Its enlarged internal profile allows complete RCV Big Bell CV axle shaft assemblies to pass through and install without disassembling the CV boot, drastically saving time during initial shop assembly and trailside repairs. Built for versatility, these adapters also support modified 2.5-ton Rockwell steering knuckle conversions.
Includes:
- (2) 2005+ Super Duty Unit Bearing Adapters
- All Required Mounting Hardware
Specifications
| Specification | Details |
|---|---|
| Manufacturer | Crane Axle |
| Material | Precision-Machined Lightweight Aluminum |
| Knuckle Compatibility | Crane Axle Magnum Outer Knuckles & Modified 2.5-Ton Rockwell Knuckles |
| Hub / Bearing Compatibility | Modified Timken 2005+ Super Duty Unit Bearing |
| Wheel Bolt Pattern Support | Standard 8x6.5" |
| Axle Shaft Compatibility | RCV Big Bell CVs (No boot removal required), 40-Spline Inners, Forged 1550 Shafts |
| Application Grade | Extreme Off-Road Steering Applications |
| Country of Origin | Made in USA |
Compatible Bolt-On Brake Kits
Fitment
Designed for custom-built steering front axles in Rock Crawlers, Rock Bouncers, Ultra4 Race Cars, and Hardcore Trail Rigs.
| Make / Application | Model / Setup | Year Range | Axle Application |
|---|---|---|---|
| Ford | F-250 / F-350 Super Duty (Unit Bearing Donor) | 2005+ | Front Unit Bearing Axle |
| Custom Steer Axle | Crane Magnum Knuckle Applications | Custom Build | Front Steering Axle |
| Custom Steer Axle | Modified Rockwell Knuckle Conversions | Custom Build | Front Steering Axle |
Fitment Notes
- Designed specifically to adapt 2005+ Ford Super Duty unit bearings onto Crane Axle Magnum Outer Knuckles.
- Compatible with Modified Timken 2005+ Super Duty Unit Bearings supporting a standard 8x6.5" wheel bolt pattern.
- Allows RCV Big Bell CV axle shafts to pass through without removing or stretching the CV boot.
- Can also be adapted to custom or modified 2.5-ton Rockwell steering knuckle assemblies.
FAQ
1. Why convert to a 2005+ Ford Super Duty unit bearing instead of a traditional spindle setup?
Modern 2005+ Ford Super Duty unit bearings offer superior wheel-end rigidity, more compact packaging, and eliminate the routine maintenance of repacking and setting bearing preload on traditional spindle setups. When paired with this adapter, you get a sealed, ultra-strong wheel bearing assembly that can be replaced quickly on the trail or in the pits.
2. How does this adapter allow me to install RCV Big Bell shafts without removing the CV boot?
Many aftermarket steering adapters have a tight internal bore that requires builders to remove or stretch the neoprene CV boot over the joint during installation—risking tears and joint contamination. Crane engineered the internal profile of this aluminum adapter with maximum clearance so the entire assembled RCV Big Bell CV and boot slide straight through.
3. Will this adapter work with standard, unmodified Ford Super Duty unit bearings?
This adapter is engineered to work seamlessly with Modified Timken 2005+ Super Duty Unit Bearings, which are machined to accept standard off-road 8x6.5" wheel bolt patterns and upgraded axle splines. Always verify your unit bearing's pilot diameter and bolt pattern before final assembly.
4. Which brake kits bolt directly to this unit bearing adapter setup?
Crane Axle offers dedicated lightweight bolt-on Wilwood brake packages designed specifically for this unit bearing conversion, including the 4-Piston Front UB Wilwood Brake Kit (CA01039N) and the heavy-duty 6-Piston Front UB Wilwood Brake Kit (CA01039N6P).
5. Is aluminum strong enough for heavy-duty steering axle applications?
Yes. Machined from high-grade aerospace aluminum, these adapters provide the immense compressive and shear strength required for 40- to 47-inch tires and high-horsepower rock bouncers while significantly shedding unsprung weight from your front axle assembly.