1403-71 – Transmission Yokes – 1100 Series – 21/23 X 0.965 Splines – 1.260″ Hub Dia

Q: What U-joint series does the 1403-71 use?
A: The 1100 series is the smallest and lightest in the standard drivetrain catalog -- it uses a U-joint smaller than the 1251 or 1310. Cap diameter for the 1100 series is correspondingly reduced. This is the correct transmission yoke for light compact applications where the OEM engineering specifically used 1100-series joints, not a substitute for 1251 or 1310 applications.

Q: What is the 21/23-spline count on the 1403-71?
A: 21 working splines with a 23-count root circle, on a 0.965" pitch diameter. This is a compact, relatively light-duty output shaft specification used on smaller-displacement vehicles. The spline interface provides less torque-carrying surface than larger-diameter designs, so this yoke is not appropriate for engine-swapped applications with significantly increased torque.

Q: Is 4.375" C-to-end unusual for a 1100-series yoke?
A: The 1100 series by design covers compact applications, and 4.375" is a typical center-to-end dimension for these installations. Measure your existing yoke CL-to-end precisely -- this series has fewer dimensional variants than the 1310 family, so a significant mismatch likely indicates a different part is needed.