2005+ Super Duty unit bearing adapter kit with bolts on a white background
Rockwell knuckle to Super Duty bearing adapter with text indicating compatibility on a white background
Close-up of a vehicle axle with a Rockwell knuckle to Super Duty bearing adapter for RCV Big Bell Axle Shaft installation.
Magnum knuckle unit bearing conversion with text on a white background
2005+ Super Duty unit bearing adapters on a white background
Close-up of a 8620 chromoly off-road steering knuckle adapter with bolts on a white background
2005+ Super Duty unit bearing adapter kit with bolts on a white background
Rockwell knuckle to Super Duty bearing adapter with text indicating compatibility on a white background
Close-up of a vehicle axle with a Rockwell knuckle to Super Duty bearing adapter for RCV Big Bell Axle Shaft installation.
Magnum knuckle unit bearing conversion with text on a white background
2005+ Super Duty unit bearing adapters on a white background
Close-up of a 8620 chromoly off-road steering knuckle adapter with bolts on a white background

Crane Axle Magnum Knuckle Aluminum Unit Bearing Adapter (Pair)

CA01035A

$549.99
/
Shipping calculated at checkout.

The Crane Axle Magnum Knuckle Aluminum Unit Bearing Adapter is designed to integrate 2005+ Ford Super Duty unit bearings with Crane Axle Magnum Outer Knuckle System for high-strength off-road steering axle applications. Engineered for rock crawling, Ultra4 racing, and custom fabricated axle builds, this adapter combines the compact packaging and serviceability of modern unit bearings with the strength required for large tires, high horsepower, and aggressive steering loads.

Machined from lightweight aluminum, these adapters reduce unsprung weight while simplifying wheel-end maintenance compared to traditional spindle systems. The design also allows complete RCV Big Bell axle shaft assemblies to be installed without disassembling the boot, improving serviceability during both assembly and trail repairs. In addition to Magnum knuckle systems, these adapters can also be used in modified 2.5-ton Rockwell steering applications.

Includes:

  • (2) 2005+ Super Duty Unit Bearing Adapters
  • All Required Hardware
Specifications 
  • Adapts 2005+ Ford Super Duty unit bearings to Magnum Outer Knuckles
  • Machined aluminum construction
  • Compatible with Modified Timken 2005+ Super Duty Unit Bearing
  • Supports standard 8x6.5" wheel bolt pattern
  • Designed for RCV Big Bell axle shaft compatibility
  • Allows axle shaft installation without CV disassembly
  • Compatible with modified 2.5-ton Rockwell knuckle conversions
  • Designed for extreme off-road steering applications
  • Made in the USA

Compatible Bolt-On Brake Kits

Fitment 
Make Model Year Range Axle Application
Ford F-250 Super Duty 2005+ Front Unit Bearing Axle
Ford F-350 Super Duty 2005+ Front Unit Bearing Axle
-- Crane Magnum Knuckle Applications -- Front Steering Axle
-- Modified Rockwell Knuckle Conversions -- Front Steering Axle

Fitment Notes:

  • Designed for Crane Axle Magnum outer knuckle systems
  • Compatible with modified Timken 2005+ Super Duty unit bearings
  • Supports standard 8x6.5" wheel bolt pattern
  • Compatible with RCV Big Bell axle shafts
Tech Insight 

Do I need modified Super Duty unit bearings to use these adapters?

Yes. These adapters are designed to work with Crane Axle's modified 2005+ Ford Super Duty unit bearings. Standard factory Super Duty unit bearings may require modification depending on your application and wheel bolt pattern requirements. Always verify your complete wheel-end package before ordering.

What axle shafts are compatible with the Magnum Unit Bearing Adapters?

These adapters were designed around RCV Big Bell axle shaft systems and allow the complete axle shaft assembly to pass through the adapter without disassembling the CV boot. Other axle shaft combinations may require verification for clearance and fitment.

Can I run these adapters on a custom Dana 60 or GM 14-Bolt front axle build?

Yes. The adapters are commonly used on custom-built front steering axles utilizing the Crane Magnum Knuckle System. They are frequently incorporated into fabricated Dana 60, GM 14-Bolt, and custom axle housing builds using Magnum knuckles and 2005+ Super Duty unit bearings.

What are the advantages of unit bearings versus traditional spindle and hub assemblies?

Unit bearings provide a compact wheel-end package with no wheel bearing preload adjustments, fewer serviceable components, and simplified maintenance. They are popular in rock crawlers, Ultra4 cars, and rock bouncers because they reduce assembly complexity while maintaining excellent strength and rigidity.

What brakes can I use with the Magnum Unit Bearing Adapter System?

The adapters are designed to work with Crane Axle's bolt-on Super Duty unit bearing brake packages, including the Wilwood 4-piston and Wilwood 6-piston lightweight brake kits. Additional brake compatibility should be verified before purchase.