The Rock Assault 9 is now available as a complete welded assembly from flange to flange including the Unit Bearing Pockets. The new Rock Assault 9 is available in 3 great sizes to fit most applications. Designed for Wheel Mount Surfaces (WMS) of 60”, 65” and 68”. We have made it easier for your axle upgrade or custom build. The assembly will also include the inner housing seals.

Trail-Gear went one step further, redesigning the Rock Assault 9 Axle Housing to allow for the use of a 10″ differential! This will give you the option to create an even stronger axle and to give you that piece of mind knowing you have the strongest axle under your rig.

Now Available in 3.5″ O.D. axle tubing.


NOTE: WMS (Wheel Mount Surface Dimensions) reached using TG Unit Hub, TG# 144012-K, and 1/4″Brake Hats. Using other components  will vary final results.  Pinion is offset 2.125 to allow for same size  axle shafts for passenger, and driver side.

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

Additional information

Weight 150 lbs
Dimensions 60 × 36 × 24 in

60", 65", 68"

Wall Thickness

1/4", 3/8"


3", 3.5"


No Inspection Hole, With Inspection Hole Kit Installed