Trail-Gear is now offering a new and improved 27-Spline Chromoly Birfield! The star of the birfield has been heat-treated to increase strength in the birfield. The current failure rate of our 27-Spline Chromoly Birfields is at 6000 ft-lbs of applied torque at a 30 degree angle. Check them out at https://www.trail-gear.com/27-spline-chromoly-birfield.