4102-1243 – Flange Yokes – 1410 Series – Bolt Circle Dia 3.937″ – Pilot Dia 2.755, M

Understanding the 4102-1243 Flange Yoke -- 1410 Series Application

Not every driveshaft terminates at a slip yoke. Many factory and performance builds use a bolted companion flange at one or both ends, and the 4102-1243 is the correct 1410 series yoke for those configurations. It presents a 4-bolt pattern on a 3.937" bolt circle with 0.480" bolt holes and a 2.755" male (raised) pilot, covering the dimensional requirements for a broad range of OEM and custom companion flanges.

Specification Summary

Series Ratings and Torque Capacity

Series 1410 represents a specific u-joint cross size and load rating. Running a mismatched series component downstream of a 1410 u-joint creates an unbalanced failure point -- the weakest link defines when and where the drivetrain breaks. The 4102-1243 is designed as a native 1410 series component, so the cap bores match the cross dimensions and the torque path remains consistent from u-joint to flange face.

Assembly Guidance

• Seat the 2.755" pilot fully before torquing -- do not rely on bolts to draw the yoke into alignment
• Distribute bolt load evenly through at least three torque passes
• Apply thread-locking compound on fasteners exposed to vibration (off-road, high-RPM)
• After initial drive, re-check bolt torque -- new joints settle slightly during first use
• CJ-to-flat dimension of 2.170" must clear u-joint lock ring or snap ring groove

Ordering Confidence

If you have confirmed that your companion flange has a 3.937" bolt circle, 0.480" bolt holes, and a 2.755" pilot bore (M), the 4102-1243 is the direct match. Universal Driveshafts stocks this part for immediate dispatch to get your vehicle back in service without delays.