Trail Gear Longfield 30 Spline Chromoly Birfield

Longfield 30-Spline Birfield This Longfield 30 spline birfield offers an increase in strength over a stock birfield. (76 percent stronger). Reminder This birfield comes with a 12 month warranty against breakage and has single heat treated internals. The Longfield birfields are made out of 100 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 internals of our Longfield birfields are made out of 4340 chromoly steel and heat-treated for superior strength.