Rock Assault 9" Rear Axle Housing w/ Bearing Pockets

$1,499.99 USD

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Wheel Mount Surface (WMS) 60" 65" 68"

Wall Thickness 1/4" 3/8"

Outer Diameter (O.D.) 3" 3.5"

SKU:200166-308812

Product Overview

Complete Rock Assault 9" Rear Axle Housing assembly compatible with Toyota Pickups, 4Runners, and custom off-road builds requiring heavy-duty axle upgrades. This professional-grade axle housing delivers unmatched strength and durability for extreme off-road applications, featuring the innovative 3-Point Attachment System™ engineering. This complete welded assembly includes unit bearing pockets and inner housing seals for turnkey installation in your custom build or axle upgrade project.

Key Features & Benefits

3-Point Attachment System™: Industry-first tube attachment providing superior support and engagement into the center section
Dual Differential Compatibility: Engineered to accept both 9" and 10" differentials for maximum strength options
Premium Construction: A572 Grade 50 steel center section with 50,000 psi minimum yield strength
Complete Assembly: Includes unit bearing pockets and inner housing seals for turnkey installation
Made in USA: Trail-Gear quality manufacturing with professional welding and precision engineering

Technical Specifications

Part Type: Complete Rear Axle Housing Assembly
Center Section Material: A572 Grade 50 Steel (1/4" formed shell)
Face Plate Thickness: 1/2 inch
Axle Tube Diameter: 3" x 1/4" wall (3.5" O.D. available)
Wheel Mount Surface (WMS): available in 60", 65", & 68" lengths
Pinion Offset: 2.125" for equal-length axle shafts
Differential Compatibility: 9" and 10" Ford-style differentials

Fitment

Application	Vehicle Type	WMS Options
1979-1995	Toyota Pickup/Truck (Custom Builds)	60", 65", 68"
1984-2023	Toyota 4Runner (Extreme Builds)	60", 65", 68"
1980-2023	Toyota Land Cruiser (Custom Applications)	60", 65", 68"
Custom Builds	Rock Crawlers/Trail Rigs	60", 65", 68"
Racing Applications	Ultra4/Desert Racing (excluded from warranty)	60", 65", 68"

Important: Non-vehicle-specific housing requires custom installation and fabrication. Professional installation recommended. WMS dimensions achieved using Unit Hub and 1/4" brake hats. Differential bolt patterns are not universal; verify compatibility before cutting or welding.

Installation & Maintenance

Installation Difficulty: Professional
Tools Required: Complete fabrication shop, welding equipment, precision measuring tools, differential setup tools
Professional Installation: Mandatory - requires expert fabrication and axle setup experience

Maintenance Tips:

Verify differential bolt pattern compatibility before final welding and assembly
Use proper differential setup procedures with professional ring and pinion installation
Inspect the unit bearing pocket welds and center section integrity after extreme use
Follow Trail-Gear torque specifications for all mounting hardware and connections

Q: What's included with this axle housing assembly?
A: Complete welded housing from flange to flange, integrated unit bearing pockets welded into housing ends, inner housing seals, and 3-Point Attachment System™ tube mounting. Differential, axle shafts, unit hubs (144012-K), brake components, and mounting hardware sold separately.

Q: Can I use a 10" differential in this 9" housing?
A: Yes, this housing is specifically redesigned to accommodate both 9" and 10" differentials, providing ultimate strength and upgrade flexibility for your build.

Q: Is this housing vehicle-specific or universal?
A: This is a non-vehicle-specific housing designed for custom builds and extreme axle upgrades. Professional fabrication and mounting are required for proper installation.

Related Trail-Gear Parts You May Need

9" or 10" Differential Assembly - Choose based on strength requirements and application
Custom Axle Shafts - Precision-made shafts for your specific WMS and spline configuration
Brake Hat Kit (1/4") - Essential for proper brake mounting and WMS calculations