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SKU: R2149 FJ80 Hellfire Knuckles

FJ80 Hellfire Knuckles
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Purchase FJ80 Hellfire Knuckles
  • FJ80 Hellfire Knuckles

  • ★★★★★ ★★★★★ 1 review
  • Part Number: R2149
  • Shipping Weight: 70.00 pounds

  • $1,125.00

FJ80 Hellfire High Steer Knuckles

The FJ80 stock axle has a lot of benefits, primarily being that it has a much stronger Birfield over any previous Land Cruiser or Toyota axle. From the factory it does have one major fault--no provision for high steer.

The original designer of these knuckles, Billy Weiss, was determined to build everything better than factory. He addressed the high steer issue by incorporating true high steer arms with 6 bolt retention and shimless adjustment. He reinforced the knuckle in just about every way. Then he took what we've learned from the mini truck knuckles over the ages--that the Toyota steering arm mounting bolts are too close together and undersized, causing the steering arm bolts to constantly require tightening and the studs to break. To remedy this common issue, Billy created a 6 stud mounting with sufficient space between the studs to lessen the leverage which caused loosening and breakage. Billy took this project 90% there, then we did the fine tuning to make it what it is today.

We took this one step further by using more common, less expensive, and stronger Dana 60 studs. The outer four studs are Dana 60 (Grade 10.9) and the inner two are 1/2" Allen head bolts (Grade 14). The tie rod and drag link holes are tapered for FJ80 tie rod ends (TRE) but can be reamed to accept GM 1 Ton TRE's or Heim Steering. Each arm comes double tapered for left-hand and right-hand drive applications. Another great feature he added was eliminating the use of shims and going to a set screw adjustment to set preload.

These only come with 25mm Trunnion Pins and bearings. Doing this vastly increases strength and load carrying capability. This is standard and not something we charge extra to upgrade. A new lower Trunnion cap is included and the bolt holes are counterbored to protect the bolt heads against any damage. We took a great product and made it even better.


  • For offroad use only
  • The HellFire Knuckles are a specially made high-pressure casting, they endure several hours of a highly difficult machine process.
  • Relocation of the track bar is necessary if this kit is used on the stock vehicle (FJ80) suspension (regardless of lift) as it causes interference with the tie rod and incorrect angle with drag link being relocated to a high steer position.
  • These WILL NOT retain abs sensors and due to the increased thickness do not allow use of the brake backing plate
  • Fits 1991-1997 FJ80 axles
  • Maximum rim backspace is 4.5"


  • (1) Pair of FJ80 Hellfire Knuckles
  • (1) Pair of High Steer Arms with FJ80 pre-tapered tie rod and drag link holes (Each arm comes double tapered for left hand and right hand drive applications)
  • (2) Sets of 25mm upper and lower trunnion bearings and pins
  • (1) Pair of lower 25mm caps (Pin comes welded in place)
  • (8) 1/2" Dana 60 chromoly studs and nuts
  • (4) 1 1/4" x 1/2" allen head bolts for the arms
  • (8) 1" x 1/2" allen head bolts for the lower caps
  • (2) Set screws with jams nuts

Write Review
★★★★★ ★★★★★
5.00/5 Stars out of 1 Reviews
Verified Buyer
Hellfire=hell yeah
Bryan Erickson (Lynden, WA, US) | October 18th, 2017
I've been eyeballing hellfire knuckles for a while since they popped up on pirate and ih8mud. Back then it seemed they were tough to get. A couple weeks ago I looked at buying some and was surprised that ruffstuff had them in stock! Well it appears ruffstuff step up to the plate and acquired the hellfire knuckles from Billy and started producing them. I had my knuckles in hand within a week, along with everything else needed to complete my steering. Install was a breeze, hardest part was dealing with the old nasty grease/gear oil. The set screw for setting trunion bearing preload is genius and makes setup a snap. People familiar with the older hellfire knuckles should know that the ruffstuff ones come with bottom caps instead of cutting your old steering arm and using it as a cap. So you get the massive trunion bearing pins top and bottom! That's a huge upgrade. If you're set on running a 80 series axle, this IS the only steering solution in my mind. I previously had Slee, and albeit it worked, it just wasn't the end all be all.... Hellfires are! If you've never dealt with ruffstuff (I hadn't previously), what a great group of guys and great company, with some really great products at awesome prices. The ONLY issue I had was one of the studs for the high steer arms was messed up (nothing to do with ruffstuff) a simple call and they had a new stud sent out that day. I will be using this company for many more future projects. One last thing, the pics and videos don't do these knuckles any justice. Once you've got them and see how stout they are you'll be happy you went this route. The best, only, and last knuckle you'll ever buy for this axle. Thank you ruffstuff, keep up the good work.

Lower cap and steering arm torque 90 lbft
Set screw tighten until you read 20 lbs on fish scale
Set screw jam nut 100 lbft


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⚠ WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer. For more information, go to
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