3103-320 – 1310 Transmission & Transfer Case 2-3-10431X Fits the GM transmissions with 32 spline output shaft Turbo 400, TH-400, Super T-10, Richmond, M22, M21, M20, Jericho, 4L85E, 4L80E and confirm dimensions for transfer cases fitment.

Q: What GM transmissions does the 3103-320 fit?
A: The 3103-320 is designed for any GM transmission with a 32-spline output shaft at 1.397" pitch diameter. Confirmed fitments include the Turbo 400 (TH400), 4L80E, 4L85E, T56, Super T-10, Richmond, M22, M21, M20, and the Jericho close-ratio box. Also crosses to certain transfer cases -- always confirm the T/C output spline count and pitch diameter independently.

Q: Is the 3103-320 the same as the T2-3-10431HP?
A: The spline spec and hub diameter are identical (31/32 x 1.397", 1.886" hub, 5.500" C-to-end), but the HP part uses a forged chromoly billet for higher torque capacity. The 3103-320 is standard-grade forged steel, appropriate for street and mild performance use. For sustained high-torque drag or road-race applications, step up to the chromoly version.

Q: Can I use this yoke with the Short TH400?
A: Yes -- the 5.500" center-to-end dimension was specifically designed for the Short TH400 tailshaft length. The Long TH400 requires the 2-3-10431X, which runs approximately 0.75" longer. Mixing short and long yokes with mismatched driveshaft lengths causes insufficient tube engagement at the transmission yoke slip, which can allow separation under deceleration.