DRIVESHAFT YOKE 31 SPLINE FITS 1330 SERIES U-JOINTS Brand New Southwest Speed Slip Yoke (SWS Part # 699-7677) 31 spline 6" Long With 4 7/8" Of Spline Length Is Measured From The Center Of The U-joint To The End Of The Yoke Accepts 1330 U-joints; 1 1/16" O.d. Cups X 3 5/8" Wide With External Clips 31 Spline Yoke Fits The Following Transmissions: Ford C-6, Ford T-56, Tremec T-45, 3650 Tko, Fmx, And Others