FJ40 Knuckle Swap


SKU: 304156-1-KIT-FLCL Category:


FJ40 Knuckle Swap Trail-Gear is proud to release a complete knuckle swap kit for the FJ40 front axle. Included in the kit is everything needed to install Trail-Gear’s 6 shooter knuckles, 30-Spline Birfields, Highsteer, and Disc Brakes.

The only item that the customer needs to source is a steering box compatible with high steer on a FJ40. In order to support all applications drag link tubing and weld in bungs are included so that the customer can build a custom drag link that is best suited to their lift and steering box combination.

This kit comes with all hardware needed and will not leave you having to run to the store in order to get the vehicle back on the road again. Trail-Gear also gives the customers a variety of options to choose from. All Knuckle Studs, Spindle Studs and Hub Studs included are made from Trail-Gear Super metal.

Kit contents may differ slightly depending on options selected. Welding Required, we recommend welding of any components to be done by a certified welder. Axle seals included in kit will not work on pre-1968 axles.
Birfield Kits Options:

  • Elocker Gun Drilled Super Set
  • Regular Gun Drilled Super Set
  • No Axles

Trunnion Bearings Options:

  • Standard Trunnion Bearings
  • Trunnion Bearing Eliminators

Hub Bodies Options:

  • OEM Hub Bodies and Manual Locking Hubs
  • TG Creeper Flange Hub Bodies and Creeper Flanges
  • Longfield Studless Hub

Included in the Kit is:

  • Fully Loaded 6 shooter Kit
  • Gun Drilled Birfield kit if desired
  • Choice of hub body
  • Brake rotors, calipers and pads
  • Brake lines
  • Backing plate eliminator
  • Super metal Knuckle studs
  • Super metal hub studs if needed
  • Manual Locking Hub or Drive Flange if needed
  • Trunnion bearings or Trunnion Bearing Eliminators
  • Wheels Studs
  • High Steer kit
  • All other necessary hardware to complete installation


  • Warranty: 12 Month Limited Warranty
  • Sold As: Kit
  • Spline: 30-Spline
  • Birfield: Long Spline
  • Trunnion: Trunnion Bearing
  • Hub Style: Drive Flange
  • Material: Metal
  • Finish: Bare
  • Color: Grey
  • Location: Front

Additional information

Weight 225 lbs
Dimensions 48 × 36 × 18 in
Birfield Option

None, Long Spline, Regular Spline

Trunnion Option

Trunnion Bearing, Trunnion Bearing Eliminator

Hub Style

Locking Hub, Drive Flange, Studless Hub


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