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.

Need help with fitment? See our flange yoke guide for bolt patterns, pilots, and measuring tips.