New 9310 Alloy Ford 28 Spline Mainshaft. T-5 Mainshaft used in our A-5 575 Torque 5 Speed Transmission. Output Shaft features a Pressed on Design 1st/2nd Synchronizer Hub that has either been welded or spiral locked to Output Shaft. Output Shaft is setup for use with Needle Bearing Design Input Shafts. This Output Shaft had the Slip Yoke splines made against using a Spicer 2-3-5981X 28 Spline Slip Yoke. In some cases Original Design Yokes will not work with this design Output Shaft.