Revolution Gear and Axle, Replacement series, Rear axle shaft for Ford 9 Inch 74-75 Bronco w/11x1.75 Brakes (w/BCA88128), Left Hand, 26.93 Inch 28 Spline (OE# D3TZ4234J). Revolution replacement series axles are made from 1541H Steel and utilize a state of the art computer controlled heat treated process. The use of better material and better heat treating process gives our replacement axles a 10 Percent increase over the OEM axles.