Fabricated Front Axle Builder Kit

100+ In Stock
Fabricated Front Axle Builder Kit

Fabricated Front Axle Builder Kit

Known for their strength, light weight, and simplicity, Toyota axles are the perfect fit for many custom off-road projects. Factory Toyota axle housings are available in a narrow range of widths which may not fit your crawler well. Trail-Gear Fabricated Axle Housings allow you to use Toyota axles in nearly any width from the narrowest of moon buggies to full-size trucks.

Trail-Gear’s Fabricated Axle Housings Builder Kits are available for Toyota 8”, 8" E-locker, or 8.4" differentials and feature all of the same specifications as our Rock Assault 9 axles. Fabricated Axle Housing Builder Kits include a 75-inch wide Trail-Gear axle housing and two Knuckle balls. You can cut the axle length to size and weld your knuckle balls where you need them. The included knuckle balls are brand new so that you no longer need to source 30 year old knuckle balls. Our knuckle balls are forged from 1035 steel, making them much stronger than stock, eliminating closed or bent knuckle balls.

We started with a 1/4" thick formed shell for the center section made out of ASTM A36 steel. This is a high-strength, low alloy, structural steel plate with a minimum yield strength of 36,000 psi! All of this is attached to an equally strong 1/2" thick faceplate for anchoring the 3.5” OD 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 leaks.

We offer two different axle tube wall thickness options. The 1/4-inch wall tube version saves weight while the 3/8-inch wall tube version provides even greater durability. We also include seal housing kits for both sides.  Set screw holes for seal housings can be plug welded if using Toyota inner axle seals in the knuckle balls.

We recommend the addition of our Axle Housing Inspection Hole Kit to allow for easy fluid level and ring gear visibility. Just select "With Inspection Hole Kit Installed" in the drop down menu above. The kit is also available in a DIY installation version (requiring drilling through the differential housing and welding on a threaded bung).


306558-KIT (8" Housing 3.5 OD - 1/4" Wall Tube Knuckle Balls) TGI-308925 With Inspection Hole Kit Installed
306559-KIT (8" Housing 3.5 OD - 3/8" Wall Tube Knuckle Balls) TGI-308926 With Inspection Hole Kit Installed
306560-KIT (8" E-Locker Housing 3.5 OD - 1/4" Wall Tube Knuckle Balls) TGI-308927 With Inspection Hole Kit Installed
306561-KIT (8" E-Locker Housing 3.5 OD - 3/8" Wall Tube Knuckle Balls) TGI-308928 With Inspection Hole Kit Installed
306562-KIT (8.4" Housing 3.5 OD - 1/4" Wall Tube Knuckle Balls) TGI-308929 With Inspection Hole Kit Installed
306563-KIT (8.4" Housing 3.5 OD - 3/8" Wall Tube Knuckle Balls) TGI-308930 With Inspection Hole Kit Installed

Note: For Trail-Gear custom shafts the max length from the center of the diff to the cut end of the tube is 32.7”


⚠ WARNING Cancer and Reproductive Harm -

  • Customer choice of Fabricated 8”, 8” Elocker, or 8.4” Axle housing
  • Customer choice of 1/4” or 3/8” wall tubing
  • 1/4” CNC formed center section
  • 1/2” Formed faceplate
  • DOM axle tube
  • 3-point attach system
  • Faceplate is machined after welding to ensure that the differential mounts flush
  • Includes 2 seal housing kits
  • Includes brand new knuckle balls
  • Cut to length housing is 75” wide
  • Ships bare
  • Oil Capacity Varies depending on axle width. We recommend having 1 Gallon of oil on hand and filling to the top of the fill plug hole


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 [email protected] 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:
      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 [email protected] 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.