1203-26S – Transmission Yokes – 1251 Series – 24/26 X 1.115 Splines – 1.375″ Hub Dia

Q: What is the difference between the 1203-26S and the 1203-26?
A: Both use the same 24/26-spline, 1.115" PD Nissan specification and 1.125" counterbore, but the "S" variant has a 1.375" hub diameter versus 1.495" on the standard 1203-26. The smaller hub is required when the tailshaft seal bore is sized for 1.375" -- using the larger-hub variant with a 1.375" seal will blow the seal lip out immediately upon installation.

Q: How does the 1251 series differ from the 1310 series?
A: The 1251 series uses a smaller U-joint than the 1310 -- the cap diameter on the 1251 is slightly smaller, making it a lighter-duty transmission yoke appropriate for lighter Nissan passenger car and compact truck applications. Never substitute a 1251 yoke for a 1310 application -- the U-joint cap diameter mismatch means the bearing caps will not seat in the yoke ear bores.

Q: Which Nissan models use the 1203-26S?
A: This yoke covers Nissan light passenger cars and compact trucks using the 24/26-spline output with the smaller-diameter tailshaft seal bore. Verify against your Nissan VIN-based parts catalog for specific model confirmation.