Rock Assault 9 Axle Housing

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ROCK ASSAULT 9 AXLE HOUSING

Rock Assault 9 Axle Housing

After years of competition testing and engineering, we are confident that The Rock Assault 9 Axle Housing is the strongest 9" axle housing on the market. This housing has been tested in W.E. Rock, CalRocs, and King of the Hammers, so we know it will stand up to the toughest terrain on earth. 

We started with a 1/4" formed shell for the center section made out of A572 Grade 50 Steel for increased strength. This is a high-strength, low alloy, structural steel plate with a minimum yield strength of 50,000 psi! All of this is attached to an equally strong 1/2" face plate for anchoring the DOM axle tubes. The axle tubes are secured by the industry's first 3-Point Attachment System, giving the tubes superior support and engagement into the center section. We also face the center section to ensure your differential mounts flush against the axle housing to prevent any leaks. Tube size options include 3”, 3.5”, or 4” OD in wall thicknesses of 1/4”, 3/8”, & 1/2” (1/2” available for 4” OD only) Our 4” OD versions are the strongest 9” axles you will find anywhere!

We also redesigned the Rock Assault 9 Axle Housing to allow for the use of both a 9" and 10" differential! This will give you the option to create an even stronger axle and give you that piece of mind knowing you have the strongest axle under your rig..

AVAILABLE OPTIONS:

Part Number Description Weight
144021-1-KIT ROCK ASSAULT 9 AXLE HOUSING - 3/8" | 3" | No Inspection Hole 82 lbs.
144022-1-KIT ROCK ASSAULT 9 AXLE HOUSING - 1/4" | 3" | No Inspection Hole 70 LBS.
144050-1-KIT ROCK ASSAULT 9 AXLE HOUSING - 1/4" | 3.5" | No Inspection Hole 75 LBS.
144049-1-KIT ROCK ASSAULT 9 AXLE HOUSING - 3/8" | 3.5" | No Inspection Hole 84 LBS.
TGI-311396 ROCK ASSAULT 9 AXLE HOUSING - 1/4" | 4" | No Inspection Hole 85 LBS.
TGI-311397 ROCK ASSAULT 9 AXLE HOUSING - 3/8" | 4" | No Inspection Hole 109 LBS.
TGI-311398 ROCK ASSAULT 9 AXLE HOUSING - 1/2" | 4" | No Inspection Hole 130 LBS.
TGI-308797 ROCK ASSAULT 9 AXLE HOUSING - 3/8" | 3" | With Inspection Hole Kit Installed 83 LBS.
TGI-308796 ROCK ASSAULT 9 AXLE HOUSING - 1/4" | 3" | With Inspection Hole Kit Installed 71 LBS.
TGI-308798 ROCK ASSAULT 9 AXLE HOUSING - 1/4" | 3.5" | With Inspection Hole Kit Installed 76 LBS.
TGI-308799 ROCK ASSAULT 9 AXLE HOUSING - 3/8" | 3.5" | With Inspection Hole Kit Installed 85 LBS.
TGI-311399 ROCK ASSAULT 9 AXLE HOUSING - 1/4" | 4" | With Inspection Hole Kit Installed 86 LBS.
TGI-311400 ROCK ASSAULT 9 AXLE HOUSING - 3/8" | 4" | With Inspection Hole Kit Installed 110 LBS.
TGI-311401 ROCK ASSAULT 9 AXLE HOUSING - 1/2" | 4" | With Inspection Hole Kit Installed 131 LBS.


Note: The differential bolt pattern on 9" Axle Housings are NOT universal. Please check before cutting or welding

Note: If you are using our Rock Assault 9 Front Axle Housing, you will need to use a 10" ram for your steering setup.

‚ö† WARNING Cancer and Reproductive Harm - www.P65Warnings.ca.gov

  • 1/4-inch formed steel shell for the center section
  • Choice of 3”, 3.5”, or 4” OD in wall thicknesses of 1/4”, 3/8”, & 1/2” (1/2” available for 4” OD only)
  • 1/2-inch faceplate
  • Axle tubes are secured by the industry's first 3-Point Attachment System™, giving the tubes superior support and engagement into the center section
  • Fits both a 9-inch and 10-inch differential
  • Includes (2) Axle Seal Housing Kits
  • Made from SAE 1026 steel DOM tubing

  • Non-vehicle specific

If you have any questions on the use or installation of this product please contact our customer support at (559)-549-6737

All products carry our 12 Month Limited Warranty. All warranties are limited to the original purchaser and are not transferable to subsequent owners of the product. The warranty period begins on the purchase date. Trail-Gear warrants that it will repair or replace, free of charge, any eligible product which, under normal conditions of use and service, proves to be defective in materials or workmanship. This warranty does not cover any labor costs incurred in diagnosis of defects, removal or reinstallation of a product, nor does it cover any other consequential expenses.

Please read and review our return and warranty requirement document before sending in products.

Warranty Exclusions


Trail-Gear Inc. warranty does not cover, and Trail-Gear Inc. shall not be liable for, any undertaking, representation, or agreements made by dealers or other third parties selling Trail-Gear products, except where such agreements are within the provisions of this Warranty.

Specifically excluded from this warranty are failures caused by lack of maintenance, misuse, negligence, modification, abuse, improper application, crash damage, installation or operation, or failures caused by unauthorized service or use of unauthorized parts.

Additionally excluded from this warranty are parts which are subject to normal wear and tear, such as bushings, fluids, hoses, gaskets, belts, etc. Products not manufactured by Trail-Gear Inc. are excluded from any warranty and shall be handled with the original manufacturer.

All parts used in a competitive racing environment are excluded from this warranty. If, after inspection, a part returned, under any warranty, is deemed to be ineligible for warranty repair or replacement, the part may be repaired or replaced for a discounted cost. Return shipping charges will apply. Any part for which a warranty replacement is sought must be returned to Trail-Gear Inc. before any replacement items can be shipped. All replacement parts shipped before the suspect part has been received and evaluated by Trail-Gear, MUST BE PAID IN FULL. In such a case, after the suspect part has been received and approved for a warranty replacement, the purchase price for the replacement will be refunded.

    To begin your warranty claim:
  • Please contact Trail-Gear Inc. at 559-252-4950 or email sales@trail-gear.com prior to returning any product under warranty to verify that warranty is still in effect.
  • Products must be shipped back to Trail-Gear Inc. at the expense of the customer.
    Ship all products to:
    ATTN: WARRANTY
    5356 E. Pine Avenue
    Fresno, Ca 93727.
  • Please place a clearly marked copy of the original invoice on the outside of the package.
  • Please include a short note stating the problem you are experiencing.

If any of the above mentioned policy is not met, the package will be refused or warranty claim denied. By completing the steps above, this will ensure faster processing of your claim so that Trail-Gear can get your product back to you as quickly as possible. All warranties are generally processed within 2-3 business days of Trail-Gear receiving the parts from you. Additional delays may be incurred if product needs additional testing or repairing.

If you are an international customer, please email the warranty department at sales@trail-gear.com to receive further instruction. International customers may have the option to field destroy an approved warranty to avoid costly return shipping. In this case, any shipping charges for replacement parts will be at the expense of the customer.

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