CALMINI BIRFIELD JOINT CUPS

THE ORIGINAL AND ONLY ENCAPSULATING CUP!

Finally, the solution to the dreaded broken Birfield Joint. The patented design of our precision machined support cups prevent the expansion and "break out" failure of the Birfield stock outer bell.  They also increase the overall strength of the joint by 70%! This is a critical item for front axle component survival when using a locker/large tire combo. Recommend for use when running CALMINI Heavy Duty Axle Shafts.  The birfield cups are sold in pairs.