Trail Gear Longfield 30 Spline Birfield/Axle Super Set Gun Drilled

Longfield FJ60 Gun Drilled 30-Spline Long Spline Super SetThe Longfield Gun Drilled 30-Spline Birfields aremade out of 100% chromoly and are precision polished to remove anyimperfections that may cause stress risers. The internals of the birfield arealso made from 4340 chromoly and are dual heat treated for superior strength.The birfield has a M8 grease zerk at the end of the stub shaft and is gundrilled through the center of the birfield to allow for grease to pass throughthe zerk fitting and into the internals. This will save you precious time byeliminating the need to disassemble your axle just to service your birfields.The Gun Drilled 30-Spline Birfields also have ashallow relief near the splines on the stub shaft known as a Machined SplineSaver. The Machined Spline Saver eliminates stress concentrations caused bygrooving from the tool that makes the splines on the stub shaft. The stressconcentration from the spline groove is a common failure point on birfield stubshafts.The axle shafts are also made out of 4340 chromolysteel. We understand that once you upgrade your axles,the next weak link is your hub gears, so we decided to include our ChromolyInner and Outer Hub Gears and Creeper Drive Flanges at no additional cost!