25mm Steering Pin Upgrade, Kit

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Marlin Crawler has revolutionized the Toyota 4WD industry again, this time with the strongest 1979-85 Toyota steering pivot system in the world.

Our new Competition Series Steering Upgrade Kit replaces the stock wimpy 17mm pivots with beefy 25mm Chromoly pins. These days with larger tires and hydro-assist steering systems, we often come across Toyota axles with blown up knuckle bearings or even worse, sheared knuckle pivot pins. The Marlin Crawler solution to this weakness starts with pivot pins that are 47% larger than stock and High-Capacity knuckle bearings that are 54% stronger with an increased contact area. These puppies are nearly the same size as Dana 60 parts!!

Next we replace the stock flimsy lower caps with an incredibly stout solid billet version.

Then we finish it off by replacing the long and exposed stud design with grade 12.9 cap bolts and serrated conical washers made in Germany. The end results is an increase in ground clearance by as much as 3/4", measuring only 1" thick!

  • CNC machined Solid Billet Steel Arms made right here in America
  • 25mm High Strength Chromoly knuckle pivot pins, made in America
    • 116% larger cross-sectional area than stock
    • We use a 78% larger 1-inch diameter pin-to-arm connection
    • The largest and strongest pin-to-arm connection on the market!
  • 54% stronger KOYO High-Capacity knuckle bearings made in Japan
  • Billet lower cap using grade 12.9 studs increases ground clearance up to 3/4"
  • Installs without any axle modifications!
  • Over 24 years of High Steer Experience
Marlin Crawler Competition Series Parts
Marlin Crawler Steering Pin Test Rig Marlin Crawler Steering Pin Test Rig

Would you put your stock Toyota parts to this kind of abuse? Here our Tundra V8-powered test rig bashes its 42-inch Pitbull ROCKER tires into the ground, defiled by Marlin Crawler Competition Series parts!

This Kit contains only the required parts to upgrade your existing High Steer system to a Competition Series Marlin Crawler High Steer system. Fully compatible with stock knuckles and axle housing.

Only compatible with Marlin Crawler High Steer arms. To install simply press out our old Chromoly 17mm pivot pin and press in our new Chromoly 25mm pivot pin. Other company's Cast and forged arms are NOT compatible.

This kit is also available with Billet High Steer Arms: Click here for more info.

Proposition 65 Warning for California Consumers

WARNING: Products we sell can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.p65warnings.ca.gov.

Related Products

The Marlin Crawler Heavy Duty 25mm Chromoly Pin Upgrade

Marlin Crawler 25mm Knuckle Pin Upgrade Kit

Marlin Crawler 25mm Pin Diameter Comparison

When we sought to build Toyota pins as large as Dana 60 lower pins, we never knew the results would be this fantastic.

The image to the left clearly shows the 116% larger cross-section of the High strength USA-made Chromoly 25mm Marlin Crawler Knuckle pin.

By replacing your stock 17mm pins you are increasing the durability and also the safety of your Toyota-axle 4WD vehicle.

Also of interest is that the stock component is a 1-piece cast setup whereas the Marlin Crawler component uses a Chromoly pin that is pressed into a solid billet cap, just like our High Steer arms.

Marlin Crawler Knuckle Bearing 25mm 17mm comparison

Here we have our new updated High-Capacity 8,500 pound-force 25mm KOYO knuckle bearing.

The inner diameter literally dwarfs that of the stock NSK bearing.

Can you believe that our KOYO bearing is 54% stronger than the stock Toyota bearing? You better believe it, baby!

Not only is our pin 47% larger, but our bearing is also 54% stronger to boot! It is a total upgrade package!

Marlin Crawler Heavy Duty Fastners for Knuckle Upgrade Kit

Knowing that no steering linkage is attached to the lower cap, designing stronger fasteners wasn't a high priority of this upgrade kit. But then again this kit is designed by Marlin and he only wants the best parts for your rig! Without compromise, the kit includes high shear and high tensile strength 12.9 grade cap bolts along with high quality serrated conical lock washers made in Germany.

The great thing about this design is that unlike factory studs our bolts do not have shoulders. Therefore our bolts contact 100% of the knuckle's threads providing a high clamping force without fear of damaging knuckle threads. Our lower bolts can be torqued to 65 ft-lbs, which is nearly three times the recommended rating of the stock studs.

Marlin Crawler Heavy Duty Rock Guard Lower Knuckle Cap

All Billet Steel parts along with their 25mm Chromoly pins are all made in the USA. As you can see on the lower caps, we are quite proud of USA made parts!

All of our steering arms and lower caps use a 78% larger 1-inch diameter pin-to-arm connection, which is the largest and strongest pin-to-arm connection on the market.

Marlin Crawler Rock Guard Lower Knuckle Cap Ground Clearance

Another impressive feature of our Billet Rock Guard lower cap is how much ground clearance is gained. As shown to the left, ground clearance is cut by a massive 60%.

Put yourself in a rocks shoe: Would you rather hit an exposed single stud or go face-to-face with our Solid Billet Rock Guard lower cap?

Stop risking bent studs with damaged delicate and exposed threads. Switch over to our Heavy Duty Knuckle Bearing Upgrade today!


Take your Toyota Axle to the Ultimate Level with the
fully tested Marlin Crawler Knuckle Upgrade Kit!


Marlin Crawler XRRA Test Rig in Action Marlin Crawler XRRA Test Rig in Action

Marlin Crawler XRRA Test Rig in Action Marlin Crawler XRRA Test Rig in Action

Marlin Crawler XRRA Test Rig in Action Marlin Crawler XRRA Test Rig in Action

Marlin Crawler XRRA Test Rig in Action Marlin Crawler XRRA Test Rig in Action

Homegrown Racing's Tundra V8-powered 42-inch tire 25mm Pin Test Rig
(Some pictures copyright HIGHREV & Chad Jock photography)

Also available as a complete upgrade kit including our Billet High Steer Arms, as pictured below.

Marlin Crawler 25mm Knuckle Pin Upgrade Kit with High Steer Arms

Marlin Crawler 25mm Pin Inside