Longfield FJ40 30-Spline Long Spline Axle and Birfield Kit The new 30 spline axle kit is a perfect match for your next budget build. This kit offers a 76.0 Percent increase in strength over stock axles without breaking the bank. The Longfield birfields are made out of 100.0 Percent chromoly and are precision polished to remove any imperfections that may cause stress risers.
The Longfield birfield housing is made out of forged 4340 chromoly steel. The axle shafts are also made out of 4340 chromoly steel. The internals of our Longfield birfields are made out of 4340 chromoly steel and heat-treated for superior strength. The long side axles have an extended spline for Land Cruiser OEM locker applications.
The spline length on the diff side is 4.75 Inch Long. The Longfield 30-spline Birfields allow up to 40.0 degrees of turning radius and have a consistent breaking point of 8900-9000 foot-pounds of torque. All testing data is based on internal testing at TGI.Specs:
